# Homework Help: Math: Trigonometry

## Recent Homework Questions About Trigonometry

**trig**

find the math product of u and v u= (6,7) v= (-3,9)

*Monday, April 23, 2012 by Sam*

**trig**

2sec(3x-(pi/3)) Find the period.

*Sunday, April 22, 2012 by Nathan*

**Trig.**

Solve. Check for extraneous solution. 6x= √20+6x

*Saturday, April 21, 2012 by Rach*

**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)Find ...

*Saturday, April 21, 2012 by Alex*

**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 by Rach*

**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 by Josh*

**Alg2/Trig**

Write the log as a single function: logx + 2logy - logz

*Thursday, April 19, 2012 by Alayna*

**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 by tabby*

**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 by tabby*

**algebra-trig help asap**

x=sec^-1 2 I really need help with this problem. Thanks

*Wednesday, April 18, 2012 by missy*

**algebra-trig help asap**

Evaluate the expression. Assume that all angles are in Quadrant I. 14. tan(arccos 3/5)

*Wednesday, April 18, 2012 by missy*

**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 by Lisa*

**algebra-trig help asap**

Evaluate the expression. Assume that all angles are in quadrant 1. 1. cos(arccos4/5)

*Wednesday, April 18, 2012 by missy*

**math, trig**

Graph one period of the following function. Show all work . y=2sinx+2cosx

*Wednesday, April 18, 2012 by shay*

**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 by jonathan*

**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 by shay*

**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 by Lisa*

**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 by Lisa*

**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 by Tsuki*

**Trig**

How do you find the exact circular function value of csc(-23pi/6)? I don't know how to do the pi symbol on the keyboard.

*Monday, April 16, 2012 by Bailie*

**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 by kiko*

**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 the...

*Sunday, April 15, 2012 by Sara*

**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 by Crystal*

**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. Its a ...

*Friday, April 13, 2012 by tabby*

**Trig**

How do i find the exact value of sin 15 using the half angle formula

*Friday, April 13, 2012 by Briana*

**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 by BreAnne*

**algebra-trig help ASAP**

Can someone please help me understand how to graph y=3cos(x/4)-5

*Thursday, April 12, 2012 by missy*

**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 by missy*

**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 by missy*

**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 by Amy*

**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 by susue*

**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 by susue*

**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= cos x ...

*Tuesday, April 10, 2012 by tabby*

**Trig**

Rewrite 7pi/5 in degrees.

*Tuesday, April 10, 2012 by Rina*

**trig**

solve the equation of the domain 0¡Ü¦È¡Ü2¦Ð 3cos^2theta - 5costheta -1 = 3sin^2theta

*Monday, April 9, 2012 by Amanda*

**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 by Lisa*

**Trig**

Find the supplement of pi/6

*Sunday, April 8, 2012 by YOLO*

**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 by Piwo*

**TRIG**

Factor 4cos^2x+4cosx-1=0

*Saturday, April 7, 2012 by Katie*

**Trig**

Factor 4cos^2x+4cosx-1=0

*Saturday, April 7, 2012 by Katie*

**Trig**

What is the supplement of 3pi/5?

*Saturday, April 7, 2012 by Jenn*

**Trig**

Complete the following statement. (1-sinθ)(1+sinθ)

*Saturday, April 7, 2012 by Jenn*

**Trig**

Find the co terminal angle for 15pi/4

*Saturday, April 7, 2012 by Jenn*

**Trig**

19pi/7 Which quadrant does the terminal side lie on?

*Saturday, April 7, 2012 by Jenn*

**Trig-help please**

Sin23=p write cos113 in terms of p

*Friday, April 6, 2012 by Piwo*

**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 by Adam*

**trig**

if one of a quadratic equation is 1/2-2i, what is the equation. the other root is 1/2+2I but i don't know how to find the equation

*Thursday, April 5, 2012 by Jess*

**trig**

if sin2x=3sin2y, find 2tan(x-y)

*Thursday, April 5, 2012 by afdafd*

**alg2/trig**

If 4x^2+9=kx, what value of k will produce equal roots? the answer is 12 but i don't understand how you get it, please help!

*Thursday, April 5, 2012 by lisa*

**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 by Rach*

**Trig.**

What is the trigonmetric fact for sin 3.14/8?

*Thursday, April 5, 2012 by Randy*

**trig**

simplify cox^2x-cos^4x

*Thursday, April 5, 2012 by BOB*

**trig**

Prove: 1/cos2A+sin2A/cos2A=sinA+cosA/cosA-sinA

*Thursday, April 5, 2012 by Piwo*

**trig**

Prove: 1/cos2A+sin2A/cos2A=sinA+cosA/cosA-sinA

*Thursday, April 5, 2012 by Piwo*

**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 by Chase*

**Trigonometry**

I'm having a lot of trouble with graphing trig functions. Can anyone tell me how to graph this equation on a graphing calculator? Sketch the graph of y= sin x in the interval 0 ≤ x ≤4π

*Tuesday, April 3, 2012 by Peter pan*

**trig**

what is the amplitude of f(X)=-6sin(3x-7)

*Tuesday, April 3, 2012 by Anonymous*

**trig**

cos(sin^-1 x)=sq rt(1-x^2) prove the identity

*Monday, April 2, 2012 by Emily*

**trig**

2cos^2 22.5-1 (find exact value)

*Monday, April 2, 2012 by kk*

**Trig**

1)y=1-tan(3pi-2x) Find period and phase shift 2)y=-sin(5x+3) Find amplitude,period,and phase shift 3)y=1-sin(3pi-2x)Find amplitude,period,and phase shift 4)y=2csc(2x-1)Find period and phase shift 5)Given the graph of y = sin (x), what transformation can be made to make the ...

*Sunday, April 1, 2012 by Lauren*

**Trig**

y=sin(2pi*x-pi) find the amplitude, period, and phase shift

*Sunday, April 1, 2012 by Lauren*

**Trig**

y=sec(2x+1) Find the period and phase shift. Sorry i'm really bad at these.

*Sunday, April 1, 2012 by Lauren*

**Trig**

y=2tan(x-1) Find the period and phase shift.

*Sunday, April 1, 2012 by Lauren*

**trig**

Give the following for the function: y=2+cos(5x+3.14 Amplitude: Period: Phase Shift:

*Sunday, April 1, 2012 by Emily*

**Trig**

A 7.25 inch circular saw blade rotates at 5200 revolutions per minute. a) Find the angular speed of the saw blade in radians per minute. b) Find the linear speed in feet per minute of one of the 24 cutting teeth as they contact the wood being cut.

*Sunday, April 1, 2012 by Emily*

**Trig**

A carousel with a 50-foot diameter makes 4 revolutions per minute. a) Find the angular speed of the carousel in radians per minute. b) Find the linear speed in feet per minute of the platform rim of the carousel.

*Sunday, April 1, 2012 by Emily*

**Trig.**

Josh kicks a soccer ball with an initial velocity of 18 feet per second out of a window from a height of 12 feet. The function h(t)= -16t^2+18t+12 represents the height of the soccer ball after t seconds.What is the domain of this function in the context of this problem?

*Sunday, April 1, 2012 by Rach*

**Trig**

Why does 11.4(7pi/18)=133pi/30 ?

*Sunday, April 1, 2012 by Robin*

**Trig**

Solve the equation 2sin(2x) = cos x. and Solve the equation cos^2(2x)–sin^2(2x)= (√3 / 2).

*Sunday, April 1, 2012 by Help*

**Trig**

Use the half-angle formulas to come up with an exact expression for each function value below. You do not have to simplify your answers. cos(pi/16)

*Sunday, April 1, 2012 by Help*

**Trig Circular Motion**

A es004-1.jpginch circular saw blade rotates at 5200 revolutions per minute. a) Find the angular speed of the saw blade in radians per minute. b) Find the linear speed in feet per minute of one of the 24 cutting teeth as they contact the wood being cut.

*Saturday, March 31, 2012 by Emily*

**Trig**

A ferris wheel at the fair has a radius of 60 feet. If it takes 24 seconds to make a full revolution, what is the linear speed for the passengers?

*Saturday, March 31, 2012 by Emily*

**trig**

2sin^2x-1=0[0,2pi)

*Thursday, March 29, 2012 by Sur*

**Geom./Trig.**

an airplane flies directly overhead at 540mph. 1 minute later is seen at an angle of elevation of 34 degrees. how far did the airplane fly during that time? what is the elevation of the plane?

*Wednesday, March 28, 2012 by Emma*

**TRIG**

IF Y=5+7C0S 4(0-7). FIND YWHEN 0=42 DEGREES. SMALLEST POSITIVE VALUE OF 0 FOR WHICH Y=1.5

*Wednesday, March 28, 2012 by BRASHUNDA*

**trig**

Two tracking stations are on the equator 134 miles apart. A weather balloon is located on a bearing of N 38°E from the western station and on a bearing of N 19°E from the eastern station. How far is the balloon from the western station? Round to the nearest mile.

*Wednesday, March 28, 2012 by Anonymous*

**trig**

Find the other endpoint of the line segment with the given endpoint and mid point. 1. Endpoint:(-1, 9), midpoint: (-9, -10) 2. Endpoint: (2, 5), midpoint: (5, 1) 3. Endpoint:(9, -10), midpoint: (4, 8)

*Wednesday, March 28, 2012 by drew*

**trig**

prove: cot^2(x)=cos(x)/(sinx)(tanx)

*Monday, March 26, 2012 by Help*

**algebra-trig help asap**

An isosceles triangle has a base 22 cm long and a base angle of 72 degrees. Find its perimeter.

*Monday, March 26, 2012 by missy*

**trig**

prove: (tan x + sec x)^2 = 2sec^2 x + 2tan x sec x - 1

*Monday, March 26, 2012 by Help!!!HElp!!!Help!!!*

**trig**

prove: (tan x + sec x)^2 = 2sec^2 x + 2tan x sec x - 1

*Monday, March 26, 2012 by Help!!!HElp!!!Help!!!*

**trig**

How do I prove : 4sinAcosAcos2Asin15 all over. :sin2A(tan225-2sinsquared A)is equal to. :root 6 - root 2 over 2

*Monday, March 26, 2012 by michelle*

**trig**

Prove: sin(x–y)sin(x+y)=sin^2(x)–sin^2(y)

*Monday, March 26, 2012 by Carl*

**calculus**

need help simplifying some trig identities such as: (csc t) (sin t) cos t = 0.75 and tan t = 0.88, find sec t and cot t; (cot2t) (sin2t) + sin2 t; csc2t - cot2t/sin2t

*Sunday, March 25, 2012 by angelia*

**trig**

Prove: (tan x+sec x)^2 = 2sec^2(x)+2tan(x)secx-1

*Saturday, March 24, 2012 by Anonymous*

**trig**

Prove (cscx+cotx)(cscx-cotx)=1

*Saturday, March 24, 2012 by Blossom*

**Trig**

Prove: (cotx sinx)(secx-cosx)=sin^2(X)

*Saturday, March 24, 2012 by Blossom*

**trig**

What is cosx=1/2?

*Thursday, March 22, 2012 by Jaime*

**Trig**

As you ride a ferris wheel, your distance from the ground varies sinusoidally with time. When the last passenger boards the ferris wheel and the ride starts moving, let your position be modeled by the diagram provided. Let t be the number of seconds that have elapsed since ...

*Thursday, March 22, 2012 by TRig*

**trig**

Solve for theta, giving a general formula for all of the solution: tan(theta)=-1 sin(theta/2)=1/2

*Thursday, March 22, 2012 by Help*

**Trig**

4sin^(2)x-3=0

*Wednesday, March 21, 2012 by Help*

**Trig**

cos(3x)=-1

*Wednesday, March 21, 2012 by One Directioner*

**Trig**

Solve Sinx=Cos2x-1 for all values between 0 and 2pi

*Wednesday, March 21, 2012 by dfg*

**trig**

Determine the least positive value of t for which d=0. d=cos((3pi/4)(t)) 0=cos((3pi/4)(t)) I got stuck on this step Please help

*Wednesday, March 21, 2012 by Help*

**trig**

Determine the least positive value of t for which d=0. d=cos((3pi/4)(t)) 0=cos((3pi/4)(t)) I got stuck on this step Please help

*Wednesday, March 21, 2012 by Help*

**trig**

If theta is a standard position angle and cot theta = 1.85, in which quadrant(s) could theta lie?

*Tuesday, March 20, 2012 by people*

**trig**

if tan(θ)=√(33) / 4 (√ does not ride over 4) find sin(θ)<0 i would just like to know the steps of how to do it.

*Tuesday, March 20, 2012 by person*

**trig**

What would be the force required to push a 100-pound object along a ramp that is inclined 10 degrees with the horizontal?

*Monday, March 19, 2012 by greenburrow*

**trig**

if sin theta equals 3/7, what is tan theta?

*Monday, March 19, 2012 by Anonymous*

**trig**

howard and keight who are 2km apart are on a horizontal plane observe a balloon in the same vertical plane with themselves the angles of elevation are 50 degrees and 65 degrees respectively find the height of the balloon. A.if its situated between howard and keight B.If it is ...

*Monday, March 19, 2012 by carlo*