Trig identities:(

4,065 results

Pre-Cal

[Note: I'm still having issues with identities with regard to trig] Verify the Trig. identities: (a). cot(x+y)=(cotxcoty-1)/(cotx+coty) (b). sin0(cot0+tan0)=sec0 [Note: 0=theta symbol]

Trig

How do you express sin4x as a trigonometric funcition of x using the identities? I think that you are supposed to start with the sine sum identity and then use the double angle identities for sin2A and cos2A, but after that I get stuck...

Precalculus

How would you solve this trig function: cos2x=sin^2-2 how do you know what trig identities to use?

trig

TRIG Identities, Gr. 12: Prove: cot4x=1-tan^2x/2tan2x

trig

Let Q be an acute angle such that sinQ=.6. Find the values of the following using Trig Identities: cosQ and tanQ

Trig

Use Trig identities to verify that sec^4(x)-tan^4(x)=1+2tan^2(x), Only work with one side of the equation

Trig

Are any of these three problems identities? 1. Cos^2x-sin^2x=1-2sin^2x 2. Sinxsecx=cosxcscx 3. Sec^4x-tan^4/sec^2x=1+sin^2x If so, how can you conclude that any of them are identities?

Trig

Are any of these three problems identities? 1. Cos^2x-sin^2x=1-2sin^2x 2. Sinxsecx=cosxcscx 3. Sec^4x-tan^4/sec^2x=1+sin^2x If so, how can you conclude that any of them are identities?

Trigonometry

Use the trig Identities to find the other 5 trig functions. Problem 7.)Tan(90-x)=-3/8 8.)Csc x=-13/5 9.)Cot x=square root of 3 10.)Sin(90-x)=-.4563 11.)Sec(-x)=4 12.)Cos x=-.2351 I need HELP!

Trig

Im having serious issues with verifying Trig. identities. Please help! Here is an example: (tanX-secX)^2= 1-sinX/1+sinX

trig

Solving Trig Functions: How Do You Solve For Sin 7.5 Using Half-Angle and Double-Angle Identities?

trig

2sin(4x)[(cos(3/2)x)(cos(5x/2)-sin((15/4)x)]+x can someone simplify this using trig identities?

Trig Identities

Please help...I'm not understanding trig identities and how to manipulate and express these two problems in their associated functions. Thanks a)Express as a function of cos (theta) 2 sin^2(theta) - 1 b)Express as a function of sin (theta) or cos (theta) tan^2(theta) - 2 sec(...

Trig identity.

I need help with verifying these trig identities: 1) sin4x = 4sinxcos - 8sin^3 x cos x 2) cos3x = cos^3 x - 3sin^2 x cos x

Trigonometry - Identities and proof

Show that cot((x+y)/2) = - (sin x - sin y)/(cos x - cos y) for all values of x and y for which both sides are defined. I tried manipulating both sides in terms of trig identities but I don't really have a solution....help would be appreciated, thanks.

Trig Identities

Prove the following identities: 13. tan(x) + sec(x) = (cos(x)) / (1-sin(x)) *Sorry for any confusing parenthesis.* My work: I simplified the left side to a. ((sinx) / (cosx)) + (1 / cosx) , then b. (sinx + 1) / cosx = (cos(x)) / (1-sin(x)) I don't know how to verify the rest.

Trig Identities

secx - sinxtanx

trig

use trig identities to rewrite: (1/(1-cos4v))-(1/(1+cos4v))

Trig identies, Calculus

Use the identities cos^2 x + sin^2 x =1 and cos2x=cos^2 x -sin^2 x to show that cos^4 x -sin^4 x = cos2x Im not sure how, I can solve my problem with half angle identities but im not sure where to start with this.

Trig

What is sin^2 - cos^2 x/ 1-2cos^2 x, using the identities.

trig

what is the correct answer in trigonometric identities. DiViDE ; x^5 + 5x^4 - 2x^3 + 3x^2 + 2x + 1 by x + 3

Trig

Please help using identities (2tan30)/(1-tan^2 30)

trig

please help me. use trig. identities to find the exact value. tan 25° + tan 5° / 1- tan 25° tan 5°

trig

please help me. use trig. identities to find the exact value. tan 25° + tan 5° / 1- tan 25° tan 5°

math

how do i solve this using trig identities? 2 csc^2x = 3 cot^2x-1

Trig Identities..

Solve any way possibly? Thank you! 1-sin^2x/1-cosx

Trig

Two pilots take off from the same airport. Mason heads due south. Nancy heads 23 west of south. After 400 land miles, how far is Nancy from Mason’s route? I think 156.29, but I'm not sure because the question comes in a lesson on sum and difference identities, and ...

Trig

verify following trigonometric identities. 1/sec0tan0 = csc0 = sin0

trig

How do I prove these trig identities? secx-cosx/tanx =sinx And 1+sinx/cosx+ cox/ 1+sinx=2secx

pre calculus 2

use the fundamental trig. Identities to simplify tan^4x+2tan^2x+1

identities trig?

find all solutions to the equation in the interval [0,2pie] cos2x=cosx

Trig Identities

Proving identities: 1) 1+ 1/tan^2x = 1/sin^2x 2) 2sin^2 x-1 = sin^2x - cos^2x 3) 1/cosx - cosx = sin x tan x 4) sin x + tan x =tan x (1+cos x) 5) 1/1-sin^2x= 1+tan^2 x How in the world do I prove this...please help... I appreciateyour time thankyou soo much!!

trig

Evaluate giving exact values and identities. Calculator based solutions are not acceptable. Thanks for any help sin (-pi/12)

Trig math

how to split up using sum and difference identities cos (13pi/12) PLeaseeeeeeeeeee help!!! thanx a million

Trig identities:(

Sin4A - cos4A = sin2A - cos2A Can i just square root the left side??:O

trig

Evaluate giving exact values and identities. Calculator based solutions are not acceptable. Thanks for any help cos (7pi/12)

trig

Evaluate giving exact values and identities. Calculator based solutions are not acceptable. Thanks for any help cos (-5pi/12)

trig

using the trigonometric identities find the exact (radical form) value of cos (105 degrees)

trig. identities

sin2x+sin2y=2sin(x+y)cos(x-y) Please helpp mee!! thank you sooo much really!!

trig

I have to factor the expression and use fundamental identities: sins^2xcscx^2-sin^2x sec^4x-tan^4x

trig

Evaluate giving exact values and identities. Calculator based solutions are not acceptable. Thanks for any help cos (4pi/3 – 3pi/4)

Trig

We started a new lesson on Monday on identities. Our test is tommorrow. I have no idea of what I'm doing! Can somebody help me study?

trig

find all values of x on interval 0-2pi. (sin4x)(cos7x)=(cos4x)(sin7x) identities should be used.

Trigonometry

Solve. 2sin(2ƒÆ) + ã3 = 0 interval [0, 2ƒÎ) How do I start this? I feel like maybe Trig Identities, but I'm not really sure.

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?

math-trig

Use the double angle identities to find sin2x if sinx= 1/square of 17 and cosx<0 . Give exact answer.

Trigonometry

Simplify the expression using trig identities: 1. (sin4x - cos4x)/(sin2x -cos2x) 2. (sinx(cotx)+cosx)/(2cotx)

Trig!

The identities cos(a-b)=cos(a)cos(b)sin(a)sin(b) and sin(a-b)=sin(a)cos(b)-cos(a)sin(b) are occasionally useful. Justify them. One method is to use rotation matricies. Another method is to use the established identities for cos(a+b) and sin (a+b).

math

how would you find the angle to (3)^.5sin(2x)-2cos(2x)+2sin^2(x)=1 I know that you have to use the trig identities but then when i substitue the sin and cos(2x) in i don't know what to do. please help

Math (trigonometry)

Trigonometry identities are so hard... I need some help proving these identities: *Oh, and I'm only in grade 11, so the identities we use are quotient identity and Pythagorean identity. sinx/(sinx + cosx) = tanx/(1 + tanx) cos^2x - sin^2x = 2cos^2x - 1 Thanks! Lucy

trig

Use trigonometric identities to find sec theta, given that tan theta = Radical 5/ 3.

trig identities

Find the exact value of cos (2theta) given csc theta = 8/3 and 0 < theta < pi/2

Trig

Eight Fundamental Identities Sec thada - Cos thada How do I do this?

trig

How to get 5degree without using calculator using identities?

Trig

Use identities to find indicated values tan (theta)= (12/5), pi <0<3pi/2 Find sin (2theta)

trig

Use identities to find indicated values tan (theta)= (12/5), pi <0<3pi/2 Find sin (2theta)

trig

Given that tan B= 7/24 with B in quadrant III, find sin 2B, cos 2B, and tan 2B, using angle identities.

Trig

Use trigonometric identities to solve the equation csc^2x -(√3+1)cotx+(√3-1)=0 in the interval [0, 2pi]

Trig identities

Has a negative -5/13 Steve. If angles x and y are in the same quadrant and sin x =3/5 and cos y= -5/13 determine the value of sin (x-y)

Pre-Calculus

This question has me stuck. Use the Pythagorean identity sin^2 Θ + cos^2 Θ = 1 to derive the other Pythagorean identities, 1 + tan^2 Θ = sec^2 Θ and 1 + cot^2 Θ = csc^2 Θ. Discuss how to remember these identities and other fundamental identities.

tRiG/ AlGeBrA

1) Use double-angle identities to write the following expression, using trigonometric functions of x instead of 4x. cos 4x 2) Use half-angle identities to write the following expression, using trigonometric functions of x instead of x/4. sin x/4

trig

use sum or difference identities to find the exact value of the trigonometric function: tan 345 please show work, i cant figure out what im doing wrong!

Trig identities

Sin x/[1-cos(-x)] = csc x + cot x Please Verify the Identity. I have been going in circle with this one... Just a hint would be nice. Thank you.

Pre-Cal (verifying trig identities)

How would you verify the identity? sin^1/2x-cosx-sin^5/2xcosx=cos^3xradsinx

trig

1) Use double-angle identities to write the following expression, using trigonometric functions of x instead of 4x. cos 4x 2) Use half-angle identities to write the following expression, using trigonometric functions of x instead of x/4. sin x/4

Trig Identities

Explain why Sin of theta= -The square root of 1-cos^2 theta is not an identity, using either graphical or numerical reasoning.

TRIG

Verify the following identity. 1) sin(x+y) __________ = tanx+tany cosxcosy 2) Write cos3x in terms of cosx I cannot figure out how to solve for identities they are so hard. Any help appreciated!:)

Trig

Column 1 Column 2 (sin theta + cos theta)sq 1 + 2sin theta cos theta Question : how do you get column 1 to be the same as column 2?? using the trig identities

Trig

Proving Identities: 2 columns (tan + cot)^2 = sec^2 + csc^2 I'm having trouble breaking down the left side to = the right side.. Any help please

trig

in proving trigonometric identities if cot theta sin theta = cos theta. what is the correct answer?

trig

what is the correct answer in proving trigonometric identities if tan theta/sin theta = sec theta

trig

what is the correct answer in proving trigonometric identities if tan theta / sin theta = sec theta

trig

use basic identities to simplify the expression. csc θ cot θ / sec θ

Trig Identities

If tan(theta)=7/13 and cos(theta)<0, what is the exact value of sin(theta)?

Trig Identities

Why does cos^2(x)= 1/2cos(2x)+1/2? I am trying to integrate, but the answer key says to first rewrite the expression like the above. I don't get how to change cos^2(x) into that. Explain?

Trig

Half Angle Identities cosx = 7/25 greater than 270 deg and less than 360 Determine cos 1/2x a. -7rt2/10 b. 7rt2/5 c.7/25 d.-4/5 I get 7rt2/5 Is this correct??

Math (Trig) a.s.a.p, thanks!

verify the identities: 1.) 2tanx-(1+tanx)^2 = -secx 2.) cos(x-330degrees)=1/2(ã3cosx-sinx) *the ãis only over the 3* 3.) 1+cos2x/sinx=cotx any help is greatly appreciated!!

Trig

How do you express these problems as single trigonometric function values or as single numbers, using identities? 1. cos^2pi/8-1/2 2. tan34degrees/2(1-tan^2 34degrees) 3. 1/8sin29.5degreescos29.5degrees

Trig

How do you express these problems as single trigonometric function values or as single numbers, using identities? 1. cos^2pi/8-1/2 2. tan34degrees/2(1-tan^2 34degrees) 3. 1/8sin29.5degreescos29.5degrees

math trig identities

a)cos4x-sin4xcot2x=-1 b)1+sinx+cosx/1+sinx-cosx=cot(x/2) i tried to ask my teacher but she doesnt know please help me!

trig

in proving trigonometric identities if sec theta - tan theta sin theta is equal to cos theta. what is the correct answer?

Trigonometric Identities

Which of the following are trigonometric identities, I have narrowed it down to two - (cscx + cotx)^2 = 1 OR sin^2(x)sec^2(x) + 1 = cot^2(x)csc^2(x)

trig identities

cos94 degrees cos18 degrees+ sin94 degrees sin18 degrees. write the expression as the sine, cosine, or tangent of an angle.

Trig

Please help me to simplify using identities 1+tan^2x/tan^2x I don't really understand how to do please help

trig

How do you solve for these identities: 1-sin^2è/cosè= cosè sin^4è-cos^4è=2sin^2è-1

Trig

If sinx = 1/4 Find the exact value of cos2x I used the formula for double angle identities : cos2x = 1-2sin^2x and got the answer 1/2 The book says the answer is 7/8 How would they get to that conclusion?

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

Social Studies

"But assuming that national identities will persist, can a European identity be built alongside them or over them? Is there such an identity, and if not, is it desirable? Is there, or can there be, such a thing as European patriotism." Based on this excerpt, what is the main ...

trig

in proving trigonometric identities if 1 + sin^2 theta is equal to 2 sin^2 theta + cos^2 theta. what is the correct answer?

trig

Use standard identities to express sin(2θ+π/3) in terms of sinθ and cosθ

trig

what is the correct answer in proving trigonometric identities if tan theta cos^2 theta + cos^2 theta

Trig/Precalc

Find the greatest possible value of 5cos(x)+6sin(x). I know that it would be a good idea to look for identities that are in the form of acos(x)+bsin(x), but I can't seem to find any. Other than that I don't really know where to go with this problem. Any help would be much ...

trig

Use the fundamental identities to simplify the expression. cos^2θ/sin^2θ+cscθsinθ I got tan^2theta

Trig

How would you find tan80 and tan55 as needed in this problem? Use identities to find each exact value. (tan80+tan55)/(1-tan80tan55)

Math

Prove Trig. Identities 1. sec è (sec è - cos è)= tan^2 è 2. tan^2 è (1 + cot^2 è) = sec^2 è

Trig

Use reduction identities to determine if the following statement is true or false: tan (A-B) = tan (B-A) Is this starement True or False ?

Trig

Simplify each expression using fundamental identities. 1. Sin theta cot theta 2. 1-sin^2 theta / cos theta

trig

Work out the following identities a)sin pheta / cos pheta b)tan pheta cos pheta

trig

Work out the following identities a) sin theta/cos theta b) tan theta cos theta

trig

We are doing trig identities in school. I need help with these five: 1.1+sinx/1-sinx=cscx+1/cscx-1 2.tanx+sinx/1+cosx=tanx 3.sec^2x/sin^2x=1/sin^2x+1/cos^2x 4.tan^2x/1+tan^2x=1-cos^2x 5.sinx-sin^3x/cos^3x=tanx

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