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October 25, 2014

October 25, 2014

**Recent Homework Questions About Trigonometry**

Post a New Question | Current Questions

**trig**

solve for the equation x sin x= -.35 180<x<270 sin x= .2 90<x<180 cos x = -.72 180< x<270 please explain, thanks :)
*Tuesday, May 15, 2012 at 8:40pm*

**Trig**

Ok i understand how to do these I'm just stuck on this one: secx + tanx = 1
*Tuesday, May 15, 2012 at 4:20pm*

**trig**

2sin(4x)[(cos(3/2)x)(cos(5x/2)-sin((15/4)x)]+x can someone simplify this using trig identities?
*Sunday, May 13, 2012 at 9:08pm*

**trig! please help!**

2sin(4t)[(cos(3/2)x)(cos(5x/2)-sin((15/4)x)]+x
*Sunday, May 13, 2012 at 8:59pm*

**trig pre calc**

cos x (sec x +cos x csc2x)=csc2x
*Sunday, May 13, 2012 at 8:16pm*

**trig**

find the values of x between 0 and 2 pi where the tangent line to the graph of y = sinxcosx is horizontal
*Sunday, May 13, 2012 at 10:40am*

**trig**

cos(π-x)=
*Friday, May 11, 2012 at 1:18pm*

**trig**

1-2sin^2(2x)
*Thursday, May 10, 2012 at 6:52pm*

**trig**

two dice are rolled, find p(2,then 3)
*Thursday, May 10, 2012 at 1:16pm*

**Trig**

simplify the expression to a single term: (1-2Sin^2 X)^2 + 4sin^2 X Cos^2 X I'm not sure how to start this or which identities to use. Any suggestions?
*Monday, May 7, 2012 at 8:01pm*

**Trig**

If you are dealt 3 cards from a shuffled deck of 52 cards, find the probability that all 3 cards are picture cards.
*Monday, May 7, 2012 at 7:22pm*

**algebra-trig help asap**

Write an equation I'm not sure how to do this though. The sine of x with an amplitude of 4, period of 3(pie) and phase shift to the right of pie/4
*Saturday, May 5, 2012 at 7:53pm*

**math algebra trig**

For the graph of each function, find an equation of the line of symmetry and the coordinates of the vertex. Tell whether the value of the function at the vertex if a maximum or a minimum: a) y = -x^2 + 4x - 7; b) y = 2x^2 + 4x; c) y = -3x^2 - 18x + 5.
*Saturday, May 5, 2012 at 7:42pm*

**algebra-trig help asap**

An isosceles triangle has a base 36 cm long and a base of 65 degrees. Find its perimeter. I'm not sure if this is right but my answer is 1250.4 in^2
*Saturday, May 5, 2012 at 6:48pm*

**PreCalculus (PLEASE HELP, IM BEGGING!)**

Can anyone please explain these problems to me?? I really need help!I need to simplify these trig expressions but I don't understand how my teacher is doing it at all and I have a quiz on this tomorrow! I've really been trying but I just don't get it! 1)Mulitply: [...
*Saturday, May 5, 2012 at 2:09am*

**trig**

If x and y are complementary angles and 5 tan x-12=0,calculate by using a diagram the value of 2sin(squared)x+cos y.
*Thursday, May 3, 2012 at 3:04am*

**trig**

What is the exact value of 11pi/8? (with steps please) :)
*Monday, April 30, 2012 at 9:55pm*

**trig**

Determine whether the vectors are parallel, perpendicular or neither. 1) v = (4,1), w = (1,-4) 2) v = (2,3), w = (4,6) 3) v = (2,3), w = (3,-3) Please and thanks!
*Monday, April 30, 2012 at 9:15pm*

**trig**

Find the component form for vector v with the given amplitude and direction angle theta. |v|=20.6, theta=102.5deg
*Monday, April 30, 2012 at 8:51pm*

**trig**

(-10√2, -10√2), find te magnitude and direction angle of the vector, measure the direction angle in [0, 360). Please help!
*Monday, April 30, 2012 at 8:16pm*

**trig**

Find the dot product of u and v u= 3i+7j v= 11i-5j
*Monday, April 30, 2012 at 6:42pm*

**Application prob. for Trig.**

Hi, A fountain in a shopping centre has a single jet of water. The height of the jet of water varies according to a sinusoidal function. A student notes that, in exactly one minute, the jet goes from a minimum height of 2m to a maximum height of 6m and back to 2m. At 13:00, ...
*Monday, April 30, 2012 at 1:19pm*

**trig**

At rest, the human heart beats once every second. At the strongest part of the beat, a person's blood pressure peaks at 120mmHg. At the most relaxed part of the beat, a person's blood pressure drops to 80mmHg. Supposing that t = 0 corresponds to the peak of the beat, ...
*Monday, April 30, 2012 at 4:05am*

**trig**

a 6 foot tall man is standing near a tree on level ground .if the man shadow 4 feet long .how many feet tall is the tree?
*Sunday, April 29, 2012 at 11:08pm*

**Honors Trig.**

A plane is flying at a speed and direction of 550 mph, 25 degrees north of west. There is a wind of 28 mph, at an angle of 19 degrees south of the east direction. How fast is the plane actually flying? What direction is the plane traveling?
*Sunday, April 29, 2012 at 2:38pm*

**Maths trig**

Use compound angle formulae to express Second harmonic i2= sin2t and the the third harmonic i3=sin3t in terms of the first harmonic sint
*Sunday, April 29, 2012 at 2:06am*

**algebra 2/trig**

Write the next term of sequence,and then write the rule for the nth term. 1)1,8,27,64,....125 the nth is 2) 3,8,15, 24,.....35 the nth is Can you help me and correct ? thank
*Saturday, April 28, 2012 at 9:16pm*

**TRIG**

5. A wheel 5.00 ft in diameter rolls up a 15.0° incline. How far above the base of the incline is the top of the wheel after the wheel has completed one revolution? A. 4.07 ft B. 13.1 ft C. 8.13 ft D. 9.07 ft
*Saturday, April 28, 2012 at 9:05pm*

**algebra2/trig**

Write the next term of sequence,and then write the rule for the nth term. 1)1,8,27,64,....125 the nth is n 2) 3,8,15, 24,.....35 the nth is Can you help me and correct ? thank you
*Saturday, April 28, 2012 at 7:55pm*

**trig question**

Hi, my question is attached to the web below (picture), because I can't draw the diagram on here. Sorry for any inconvenience. Please help and thanks. imageshack . us/photo/my-images / 845 / img0043gx . jpg/
*Saturday, April 28, 2012 at 6:02pm*

**trig-math**

4. A carpenter wants to be sure that the corner of a building is square and measures 6.0 ft and 8.0 ft along the sides. How long should the diagonal be? A. 12 ft B. 10 ft C. 11 ft D. 14 ft 5. A wheel 5.00 ft in diameter rolls up a 15.0° incline. How far above the base of ...
*Saturday, April 28, 2012 at 4:32pm*

**trig question**

NEW DIAGRAM: On a unit circle, sin x = square root 3 over 2, with center O. Vertical line from top to center of circle is PO. Horizontal line from middle to right of circle is OE. Another vertical line of AB is parallel to PO. And radius of circle (line from O to A) is 1 unit...
*Saturday, April 28, 2012 at 2:57pm*

**trig question**

On a unit circle, sin x = square root 3 over 2, with center O. Vertical line from top to center of circle is PO. Horizontal line from middle to right of circle is OE. Another vertical line of AB is parallel to PO. And radius of circle (line from O to A) is 1 unit. From A to E ...
*Saturday, April 28, 2012 at 2:49pm*

**math-TRIG**

1. Which angle measure is consistent with all of the following criteria? (i) The reference angle is 40°. (ii) The angle is more than one revolution. (iii) The angle's terminal side is in Quadrant II. (iv) The angle isn't positive. A. –580° B. –500°...
*Saturday, April 28, 2012 at 1:46pm*

**trig problem**

Hi, A fountain in a shopping centre has a single jet of water. The height of the jet of water varies according to a sinusoidal function. A student notes that, in exactly one minute, the jet goes from a minimum height of 2m to a maximum height of 6m and back to 2m. At 13:00, ...
*Saturday, April 28, 2012 at 1:27pm*

**Trig. application**

Hello.. In your previous solution to the question: "Dave is going for a ride on his unicycle. The radius of the wheel is 25.5cm. When he gets on, the valve of the wheel is at its maximum height. He pedals along a path at a speed of 30km/h. At what height will the valve be...
*Saturday, April 28, 2012 at 1:21pm*

** math - trig**

1.Which angle measure is consistent with all of the following criteria? (i) The reference angle is 40°. (ii) The angle is more than one revolution. (iii) The angle's terminal side is in Quadrant II. (iv) The angle isn't positive. A. –580° B. –500°...
*Saturday, April 28, 2012 at 4:06am*

**Trig. application**

Dave is going for a ride on his unicycle. The radius of the wheel is 25.5cm. When he gets on, the valve of the wheel is at its maximum height. He pedals along a path at a speed of 30km/h. At what height will the valve be located after he has cycled for 4 minutes? How do I find...
*Saturday, April 28, 2012 at 1:01am*

**Trig Help!**

Question: Trying to find cos π/12, if cos π/6 = square root 3 over 2, how to find cos π/12 using DOUBLE angle formula? This is what I got so far.. cos 2(π/6) = cos (π/6 + π/6) = (cos π/6)(cos π/6) - (sin π/6)(sin π/6) = cos^2...
*Friday, April 27, 2012 at 11:59pm*

**Solving Trig equation**

Solve the trig equation exactly in the interval 0≤x≤2π. tan x + tan π/3 ------------------ = square root 3 1 - tan x tan π/3
*Friday, April 27, 2012 at 11:41pm*

**trig**

Consider the trigonometric function f(t) = -3+4cos(pi/3(t-3/2)) What is the amplitude/period of f(t)? What are the maximum and minimum values attained by f(t)?
*Friday, April 27, 2012 at 3:28am*

**alg2/trig**

how would you express cos(75 as a single fraction?
*Thursday, April 26, 2012 at 11:11pm*

**Trig Question**

Given that tan x= -3/4 and x is in the second quadrant. Find sin 2x, cos 2x, and tan 2x (Exact, no decimals). Please show step-by-step, thank you!
*Thursday, April 26, 2012 at 4:55pm*

**trig**

(sec6x+sin2x)/(sin6x-sin2x)=tan4xcot2x
*Wednesday, April 25, 2012 at 11:26am*

**trig**

Prove that if Sinx=5/13 and Siny=12/13, where x and y angles in Q1, then Sin(x+y)=1
*Tuesday, April 24, 2012 at 4:55pm*

**trig**

find the math product of u and v u= (6,7) v= (-3,9)
*Monday, April 23, 2012 at 7:19pm*

**trig**

2sec(3x-(pi/3)) Find the period.
*Sunday, April 22, 2012 at 5:56pm*

**Trig.**

Solve. Check for extraneous solution. 6x= √20+6x
*Saturday, April 21, 2012 at 2:15pm*

**Trig**

Dalco manufacturing estimate that its weakly profit, P, in hundreds of dollars,can be approximated by the formula P= -4x²+8x+7, where x is the number of units produced per week, in thousands. 1)How many units should the company produce per week to earn maximum profit 2)...
*Saturday, April 21, 2012 at 1:53pm*

**Trig.**

Subtract. Simplify is possible. (x^2-3x-28)/(x^2-x-42) -(x^2+10x+24)/(x^2+x-12)
*Saturday, April 21, 2012 at 1:36pm*

**Trig**

sin^4t-cos^4t/sin^2t cos^2t= sec^2t-csc^2t i have =(sin^2t+cos^2t)(sin^2t+cos^2t)/sin^2tcos^2t then do i go =(sin^2t+cos^2t)/sin^2tcos^2t stumped
*Thursday, April 19, 2012 at 8:26pm*

**Alg2/Trig**

Write the log as a single function: logx + 2logy - logz
*Thursday, April 19, 2012 at 6:20pm*

**Trig/Precalc**

solve 6=e^0.2t Round your answer to the nearest hundredth Someone please help me - I don't understand this problem at all!
*Thursday, April 19, 2012 at 12:55pm*

**Trig?Precalc**

write the rectangular equation x^2+y^2=6 in polar form. I do not want people to just post the answer! Please, show your work so that I can understand how to do these kinds of problems myself! Thank you and God Bless!
*Thursday, April 19, 2012 at 12:40pm*

**algebra-trig help asap**

x=sec^-1 2 I really need help with this problem. Thanks
*Wednesday, April 18, 2012 at 8:06pm*

**algebra-trig help asap**

Evaluate the expression. Assume that all angles are in Quadrant I. 14. tan(arccos 3/5)
*Wednesday, April 18, 2012 at 5:56pm*

**Trig - Please help**

Can anyone help with this question? Now suppose that, starting with the ﬁrst row of seats, the ﬂoor of the seating area is inclined at an angle of Theta = 25 degrees above the horizontal, and the distance that you sit up the incline is x, as shown in the ﬁ...
*Wednesday, April 18, 2012 at 5:24pm*

**algebra-trig help asap**

Evaluate the expression. Assume that all angles are in quadrant 1. 1. cos(arccos4/5)
*Wednesday, April 18, 2012 at 4:42pm*

**math, trig**

Graph one period of the following function. Show all work . y=2sinx+2cosx
*Wednesday, April 18, 2012 at 2:13pm*

**trig**

a 7 foot tall man is standing 65 feet away from a tower. if the angle of elevation is 35 degrees. what is the height of the tower to nearest tenth of a foot?
*Wednesday, April 18, 2012 at 11:11am*

**mth, trig**

Given cos a=-7/25 in quadrant II , and sin b=-12/13, in quadrant IV , find cos(a+b) and sin2a
*Wednesday, April 18, 2012 at 11:10am*

**Trig**

Can anyone help with this question. Now suppose that, starting with the ﬁrst row of seats, the ﬂoor of the seating area is inclined at an angle of Theta = 25 degrees above the horizontal, and the distance that you sit up the incline is x, as shown in the ﬁ...
*Tuesday, April 17, 2012 at 4:49pm*

**Trig**

Can you show us how to use law of cosines to show that theta equals inverse cosine of (a^2 + b^2 -484)/(2ab) where a^2=(7+xcos a)^2 + (28-xsin a)^2 and b^2=(7+xcos a)^2 + (xsin a -6)^2? Thanks
*Tuesday, April 17, 2012 at 8:00am*

**trig**

A 100 kg box slides with constant velocity down a ramp inclined at 20 degrees, with the horizontal. Find the frictional force acting on the box.
*Tuesday, April 17, 2012 at 4:15am*

**Trig**

How do you find the exact circular function value of csc(-23pi/6)? I dont know how to do the pi symbol on the keyboard.
*Monday, April 16, 2012 at 1:12am*

**trigonometry**

given that sin alpha/2 = 2/3, and that alpha/2 is in quadrant II, determine the exact values of all trig functions for alpha.
*Sunday, April 15, 2012 at 12:06pm*

**trig**

A submersible traveling at a depth of 250 feet dives at an angle of 15 degrees with respect to a line parallel to the water's surface. It travels a horizontal distance of 1500 feet during the dive. What is the depth of the submersile after the dive?Explain how the angle of...
*Sunday, April 15, 2012 at 10:53am*

**Math- Trig**

1. Determine the exact value of cos^-1 (pi/2). Give number and explanaton. 2. Determine the exact value of tan^-1(sq. root 3). with explanation. 3. Determine exact value of cos(cos^-1(19 pi)). with explanation. 4. Determine the exact value of sin(sin^-1(20 pi)). with ...
*Saturday, April 14, 2012 at 9:15pm*

**Trig/PreCalc**

Teach me how to express 5sqrt3 - 5i in polar form please. I don't want you to do the work for me. Just show me the steps I need to do the work properly on my own. Otherwise I will not pass this class or the exam when I enter college, and I do not want to retake PreCalc. ...
*Friday, April 13, 2012 at 3:44pm*

**Trig**

How do i find the exact value of sin 15 using the half angle formula
*Friday, April 13, 2012 at 3:17pm*

**Trig**

can I please have help with these 3 questions? 1. Solve this equation graphically on the interval [0, 2ð]. list the solutions. sin(2x)-1=tan x 2. solve sin x cos x= sqrt3/4 3. solve tan^2 x-3tan x+2=0 thank you! show step by step please.
*Friday, April 13, 2012 at 2:02am*

**algebra-trig help ASAP**

Can someone please help me understand how to graph y=3cos(x/4)-5
*Thursday, April 12, 2012 at 2:58pm*

**algebra-trig**

Can someone please explain to me how to graph sine and cosine step by step because I am so confused and I really really need help.
*Thursday, April 12, 2012 at 1:19pm*

**algebra-trig**

Can someone please explain to me how to graph sine and cosine step by step because I am so confused and I really really need help.
*Thursday, April 12, 2012 at 1:19pm*

**Math - Trig**

A projectile is fired with an initial velocity of 88 ft/sec at an angle of 35° to the horizontal. Neglecting air resistance, what is the time of impact? I just can't figure it out.
*Wednesday, April 11, 2012 at 12:22pm*

**microsoft excell 2007**

entering the formula=SUM(C5:C18)is cell C19 will resolve in which of the following? (a)cells C5 and C18 will be added together (b)cells C5 and C18,and C19 will be added together (c)the total of cells C5 to C19 will appear in cell C19 (d0the total of cells C5 to C18 will appear...
*Wednesday, April 11, 2012 at 10:34am*

**microsoft excell 2007**

when working with predefined formulas in excel,what category contains the boolean functions? (a)math and trig (b)recently used (c)logical (d)auto sum my answer is c debbie needs to print her table.which of the following is not an excel print program? (a)title (b)table (c)...
*Wednesday, April 11, 2012 at 6:53am*

**trig/precalc**

a car's flywheel has a timing mark on it's outer edge. the height of the timing mark on the rotating flywheel is given by y=3.55sin[x - (pi/4)]. graph one full cycle of this function. I was not taught how to graph a function like this, only the simple y= sin x and y= ...
*Tuesday, April 10, 2012 at 6:07pm*

**Trig **

Rewrite 7pi/5 in degrees.
*Tuesday, April 10, 2012 at 3:17pm*

**trig**

solve the equation of the domain 0¡Ü¦È¡Ü2¦Ð 3cos^2theta - 5costheta -1 = 3sin^2theta
*Monday, April 9, 2012 at 10:29pm*

**Trig**

A ferris wheel has a 14 meter diameter and turns counterclockwise at 6 rpm. a) Assuming that the center of the wheel is the origin of an x-y coordinate plane, write functions to find the position (x,y) of a rider that starts at the bottom of the wheel. b) Where is the rider 2 ...
*Sunday, April 8, 2012 at 7:54pm*

**Trig **

Find the supplement of pi/6
*Sunday, April 8, 2012 at 6:58pm*

**Trig-desperate**

f(x)=sin2x and g(x)=1/2tanx for x is the element of [-90;180] 8.1)calculate the x-coordinates of the points of intersection of f and g.
*Sunday, April 8, 2012 at 5:24am*

**TRIG**

Factor 4cos^2x+4cosx-1=0
*Saturday, April 7, 2012 at 7:19pm*

**Trig**

Factor 4cos^2x+4cosx-1=0
*Saturday, April 7, 2012 at 7:04pm*

**Trig **

What is the supplement of 3pi/5?
*Saturday, April 7, 2012 at 3:28pm*

**Trig **

Complete the following statement. (1-sinθ)(1+sinθ)
*Saturday, April 7, 2012 at 3:20pm*

**Trig**

Find the co terminal angle for 15pi/4
*Saturday, April 7, 2012 at 2:44pm*

**Trig **

19pi/7 Which quadrant does the terminal side lie on?
*Saturday, April 7, 2012 at 2:06pm*

**Trig-help please**

Sin23=p write cos113 in terms of p
*Friday, April 6, 2012 at 1:33am*

**Trig Help Please!!!**

Find the indicated angle è. (Use either the Law of Sines or the Law of Cosines, as appropriate. Assume a = 95 and c = 137(angle B=38). Round your answer to two decimal places.)
*Thursday, April 5, 2012 at 11:43pm*

**trig**

if one of a quadratic equation is 1/2-2i, what is the equation. the other root is 1/2+2I but i dont know how to find the equation
*Thursday, April 5, 2012 at 11:02pm*

**trig**

if sin2x=3sin2y, find 2tan(x-y)
*Thursday, April 5, 2012 at 10:17pm*

**alg2/trig**

If 4x^2+9=kx, what value of k will produce equal roots? the answer is 12 but i dont understand how you get it, please help!
*Thursday, April 5, 2012 at 10:07pm*

**Trig.**

Find to the nearest degree, all values of ө less than 360˚ that satisfy the equation 2tan^2θ-2tanθ=3
*Thursday, April 5, 2012 at 8:48pm*

**Trig.**

What is the trigonmetric fact for sin 3.14/8?
*Thursday, April 5, 2012 at 11:39am*

**trig**

simplify cox^2x-cos^4x
*Thursday, April 5, 2012 at 11:30am*

**trig**

Prove: 1/cos2A+sin2A/cos2A=sinA+cosA/cosA-sinA
*Thursday, April 5, 2012 at 8:44am*

**trig**

Prove: 1/cos2A+sin2A/cos2A=sinA+cosA/cosA-sinA
*Thursday, April 5, 2012 at 8:43am*

**trig**

If sin A= 1/4 and sin B= -1/2, with A in QII and B in QIV, find tan(A+B)
*Thursday, April 5, 2012 at 12:08am*

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