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March 31, 2015

March 31, 2015

**Recent Homework Questions About Trigonometry**

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**graphing trig functions**

given y=(3x+2pi) how would i graph one period this without a calculator? amplitude:1 period: 2pi/b = 2pi/3 is this correct? what is the minimum and maximum points?
*Sunday, May 20, 2012 at 10:15pm*

**trig**

how can you find points of a tri equation at orgin 1/4, 1/2, 3/4, and end of the period
*Sunday, May 20, 2012 at 9:53pm*

**Trig**

Find two values of theta that satisfy the equation. give your answers in degrees (0degrees <theta<360degrees ) and radians (0<theta<2pi) a. sin θ= sqrrt3/2 b.sin θ= - sqrrt3/2
*Saturday, May 19, 2012 at 10:44pm*

**Trig**

Find the radian measure of the central angle of a circle of radius r that intercepts an arc of length s.? Radius, r=16 ft Arc length, s=10 ft
*Friday, May 18, 2012 at 12:51pm*

**graphing trig functions**

for graphing basic trig functions such as y=2sinx or y=1/3cosx, how do you know what the points are to graph with out using a calculator?
*Friday, May 18, 2012 at 12:31am*

**trig**

write sin4xcos2 as the sum or difference of two functions. answers: 1/2(cos6x+cos2x), 1/2(cos2x-cos6x), 1/2(sin6x+sin2x), sin6x-sin2x
*Thursday, May 17, 2012 at 9:38pm*

**trig**

write sin4xcos2 as the sum or difference of two functions. answers: 1/2(cos6x+cos2x), 1/2(cos2x-cos6x), 1/2(sin6x+sin2x), sin6x-sin2x
*Thursday, May 17, 2012 at 7:18pm*

**trig**

find the angle between vector U=<2,3> and V=<1,-5> answers: 88 degrees, 45 degrees, 135 degrees, or 92 degrees...?
*Thursday, May 17, 2012 at 7:13pm*

**trig function**

Suppose f(x)=cos x - sin x and g(x)=cos x + sin x. Explain why the graph of (fxg)(x) is equivalent to the graph of h(x)=cos x after it has been horizontally compressed by a factor of 1/2. Please help, thank you!
*Thursday, May 17, 2012 at 7:10pm*

**trig**

write y=sinx-cosx in the form y=ksin (x+a), where the measure of a is in radians. answers: sqrt2sin (x+3pi/4), sqrt2sin (x+5pi/4), sqrt2sin (x+pi/4), or sqrt2sin (x+7pi/4) ...?
*Thursday, May 17, 2012 at 6:49pm*

**trig**

write sin4xcos2 as the sum or difference of two functions. answers: 1/2(cos6x+cos2x), 1/2(cos2x-cos6x), 1/2(sin6x+sin2x), sin6x-sin2x
*Thursday, May 17, 2012 at 6:42pm*

**trig**

Write an equation for simple harmonic motion, given that the amplitude equals 4 inches and the period equals 2 seconds and the max displacement occurs when t=0. answers: y=4sin pi t, y=4cos pi t, y=4cos t, y=4sin2 pi t
*Thursday, May 17, 2012 at 6:24pm*

**trig**

an angle with the radian measure of 9pi/5. find radian measure of its reference angle. answers: -4/5, 4pi/5, -pi/5, or pi/5
*Thursday, May 17, 2012 at 6:21pm*

**trig**

what is the exact value of sin[tan^-1(2/3)]
*Thursday, May 17, 2012 at 6:19pm*

**trig**

U=5i+11j and V=2i-3j, find 2U-7U
*Thursday, May 17, 2012 at 5:02pm*

**trig**

write 2+2 squareroot of 3i in trig form.
*Thursday, May 17, 2012 at 5:01pm*

**trig**

find the angle between vectors U= <2,3> and V= <1, -5>
*Thursday, May 17, 2012 at 4:53pm*

**trig**

a vector has a magnitude of 16 and direction of 120 degrees. write the vector in terms of unit vecotrs i and j.
*Thursday, May 17, 2012 at 4:52pm*

**trig**

what is the magnitude and direction of the vector U= -2i - 3j
*Thursday, May 17, 2012 at 4:50pm*

**trig**

write y=sinx-cosx in the form y=ksin (x+a), where the measure of a is in radians.
*Thursday, May 17, 2012 at 4:48pm*

**trig**

solve 2cos^2x-sinx=1, 0 < or equal to x < 2pie
*Thursday, May 17, 2012 at 4:47pm*

**trig**

write sin4xcos2 as the sum or difference of two functions.
*Thursday, May 17, 2012 at 4:45pm*

**trig**

what's the single trig. function of cos6xcosx-sin6xsinx
*Thursday, May 17, 2012 at 4:44pm*

**trig**

Given sin a = 15/17 with a in Quadrant I and cos beta = 4/5 with beta in QuandrantIV, find the exact value of cos(a+beta)
*Thursday, May 17, 2012 at 4:43pm*

**trig function**

Suppose f(x)=cos x - sin x and g(x)=cos x + sin x. Explain why the graph of (fxg)(x) is equivalent to the graph of h(x)=cos x after it has been horizontally compressed by a factor of 1/2. Thanks so much...
*Thursday, May 17, 2012 at 2:51pm*

**trig function**

Suppose f(x)=cos x - sin x and g(x)=cos x + sin x. Explain why the graph of (fxg)(x) is equivalent to the graph of h(x)=cos x after it has been horizontally compressed by a factor of 1/2. Thanks so much...
*Thursday, May 17, 2012 at 2:51pm*

**trig function**

Suppose f(x)=cos x - sin x and g(x)=cos x + sin x. Explain why the graph of (fxg)(x) is equivalent to the graph of h(x)=cos x after it has been horizontally compressed by a factor of 1/2. Thanks so much...
*Thursday, May 17, 2012 at 2:50pm*

**trig**

what is the amplitude, phase shift, and period of -3sin(2t- pie/3)
*Wednesday, May 16, 2012 at 10:56pm*

**trig**

on a triangle, A = 50 degrees, B = 81 degrees, and c = 12. what does a, b, and C equal?
*Wednesday, May 16, 2012 at 10:54pm*

**trig**

inverse tan x = inverse cos 4/5
*Wednesday, May 16, 2012 at 9:35pm*

**trig**

A wheel rotates at 100 revolutions per second. find the angle velocity in radians per second.
*Wednesday, May 16, 2012 at 9:32pm*

**trig**

find the single term of cos^2 4theta - sin^2 4theta
*Wednesday, May 16, 2012 at 9:23pm*

**trig**

find the period of f(x)=-2cot x/5
*Wednesday, May 16, 2012 at 9:21pm*

**trig**

what is the single term of csc^2 theta-1 over csc^2 theta
*Wednesday, May 16, 2012 at 9:15pm*

**trig**

what is the angle of A? C = 125 degrees, a = 18, and c = 42
*Wednesday, May 16, 2012 at 9:11pm*

**trig**

find the supplimentary angle of pie over 8
*Wednesday, May 16, 2012 at 8:45pm*

**trig**

find the exact radian of 84 degrees
*Wednesday, May 16, 2012 at 8:44pm*

**trig**

Find the amplitude of f(t)=1/3sin8t
*Wednesday, May 16, 2012 at 8:43pm*

**Trig **

Find the eccentricity of the ellipse. x^2+7y^2=35
*Wednesday, May 16, 2012 at 7:26pm*

**trig and combine function**

Suppose f(x)=cos x - sin x and g(x)=cos x + sin x. Explain why the graph of (fxg)(x) is equivalent to the graph of h(x)=cos x after it has been horizontally compressed by a factor of 1/2. Thanks so much...
*Wednesday, May 16, 2012 at 6:13pm*

**trig**

3e^2x=18
*Wednesday, May 16, 2012 at 2:24pm*

**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*

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