69 Answered Questions for the topic Trigonometry Identities

11/30/16

Need Urgent Trig Help!!
Find the value for sin (θ) if the following conditions hold: cos(2(theta)) = 3/5 and 90(degrees) < (theta) < 180(degrees) A. (1/25) B. (sqrt5/25) C. (2 sqrt5/5) D. (sqrt5/5)
Follows • 2
Expert Answers •1

11/06/16

Sin(45-x)=cos(45+x) prove the identity
Sin(45-x)=cos(45+x) How to prove this identity? 
Follows • 2
Expert Answers •1

06/12/16

Can someone walk me through simplifying sec(?)?^2 * cot(?) * cos(?) =
  I thought it'd be  (1 / cos(θ)2) * (1 / tan(θ)) * (cos(θ) / 1)   Which would get you cos(θ) / cos(θ)2 * tan(θ)   And then coming out to 1 / cos(θ) * tan(θ)   but that doesn't make sense... more
Follows • 2
Expert Answers •1

05/02/16

Write the expression as the sine or cosine of an angle.
cos7y cos3y -sin 7y sin3y= ?
Follows • 2
Expert Answers •1

04/02/16

Solve for x in the equation 4cos4x=0
i need step by step soln plz thank u
Follows • 2
Expert Answers •1

03/23/16

If cos(pi/2-X) =4/5. Find sin(-x)
 Please help me solve this equation to better help me to understand trig Identites.
Follows • 1
Expert Answers •1

03/15/16

Find the exact value if sin x= -5/13, cos y= 4/5, 3pi/2<x<2pi, and 3pi/2<y<2pi what is tan(x+y)
I am a little confused on this and it would be nice if someone could work through it so I can understand this problem
Follows • 2
Expert Answers •1

11/29/15

Please help me with these identity proofs!!
1) (cscx + cotx) / (tanx + sinx) = cotxcscx   2) (1/secx) -secx = -sinx   3) (1-tan^2x / 1-cot^2x) = -tan^2x
Follows • 2
Expert Answers •2

11/24/15

cos(11pi/12) using Sum and difference identities
could someone explain finding cos(11pi/12) using Sum and difference Identities. it must use one of... more
Follows • 4
Expert Answers •3

10/25/15

sin^2 x/2 = tanx-sinx/2tanx
=(sinx/cosx - sinx)/ (2sinx/cosx) = sinx-sinxcosx/cosx • cosx/2sinx = sinx (1-cosx)/2sinx = 1-cosx/2 now im lost help!!
Follows • 2
Expert Answers •1

10/24/15

Express cos4x as a trig function of x
Using only the double angle identities how to solve for this? im stucked after 2cos^2 (2x) -1
Follows • 2
Expert Answers •1

10/22/15

1/8sin29.5cos29.5
I know that i should multiply something to it for it to become 2sinAcosA for me to be able to solve it. Unfortunately, if i multiply2/2 to it will just become 2/16 that will just bounce back to 1/8... more
Follows • 2
Expert Answers •1

10/19/15

Tan(theta+30)
tana+tanb/1-tanatanb   im confused becase sqrt of 3 over 3 is the value of tan 30 so its hard to solve the arithmetic and the algebra. help please!
Follows • 2
Expert Answers •1

10/07/15

Verify/prove: (1-cos^2x)(1+cos^2x) = 2sin^2x-sin^4x
I chose to manipulate the left hand side. So i got 1+cos2x-cos2x-cos4x when i simplify it will be 1-cos4x i will break it into pieces so (1-cos2x)(1+cos2x) i can change the first term to sin so... more
Follows • 2
Expert Answers •1

10/03/15

Find the solutions of the equation that are in the interval [0, 2p). (Enter your answers as a comma-separated list.
If there is no solution, enter NO SOLUTION.) 2 -2 sin t = 2 sqrt(3)cos t   My solutions were pi/2, 7pi/6, and 11pi/6. 
Follows • 2
Expert Answers •1

04/27/15

Trig identities!
Please help, I have no idea!    Solve the following trigonometric equation sin^2x - cos^2x = 1/4. 
Follows • 2
Expert Answers •1

01/19/15

prove the identity
(secθ-tanθ)^2=2secθtanθ
Follows • 2
Expert Answers •1

01/08/15

How can I solve sin(2x) = sin(x/2) for all values of x?
I can find x = 0, and also can show that cos x = (1/4)*(-1+/-sqrt(5)), but I don't know how I should have known that the latter cosines of x correspond to angles involving fifths of pi (radians)?... more
Follows • 2
Expert Answers •1

01/03/15

Solve for all values of 2sinx-1=0. in terms of pi
(show work)  where 0≤x<2π  
Follows • 2
Expert Answers •1

07/24/14

How to prove this identity
tan3x - tan2x- tanx = tan3xtan2xtanx
Follows • 2
Expert Answers •1

05/05/14

verify identity
sin(X)sec(x)=1-(cos^2)x/sin(X)cos(X)
Follows • 1
Expert Answers •1

01/03/14

Rewrite 6(sin5x)cos2x
This is for my trig class. Thanks for the help!
Follows • 3
Expert Answers •2

12/31/13

Use the sum or difference formulas to determine: A. sin105 degrees B. tan15 degrees
This is for my trig class. Thanks for the help!
Follows • 3
Expert Answers •2

12/12/13

Verify the identity 1/tan(theta)csc(theta) = cos(theta)
This is for my trig class, and the directions say to verify the identity. Thanks so much.
Follows • 3
Expert Answers •3

12/11/13

Q2 POW #3 -Trig Identities
1) given the double angle identity for cosine: cos2θ=cos2θ-sin2θ      Prove: cos3θ = cos3θ - 3cosθsin2θ         and: cos4θ = cos4θ - 6cos2θsin2θ + sin2θ 2) Continue this process, finding an... more
Follows • 3
Expert Answers •2
2

Still looking for help? Get the right answer, fast.

Ask a question for free

Get a free answer to a quick problem.
Most questions answered within 4 hours.

OR

Find an Online Tutor Now

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.