Half angle identities Find exact

Half angle identitiesFind exact values of a) cos 1/2 b) sin 1/2 c) tan 1/2 based on: cos = 1/5 greater than 270 deg less than
1. 2 answers
2. asked by Don
3. 496 views
Use half angle identities to find exact value.Given tan theta = -sqrt 2 / 2 and theta lies in quadrant IV, find cos theta / 2.
1. 1 answer
2. asked by Anonymous
3. 509 views
1.)Find the exact solution algebriacally, if possible:(PLEASE SHOW ALL STEPS) sin 2x - sin x = 0 2.) GIVEN: sin u = 3/5, 0 < u <
1. 3 answers
2. asked by MAKITA
3. 1,072 views
4. Find the exact value for sin(x+y) if sinx=-4/5 and cos y = 15/17. Angles x and y are in the fourth quadrant.5. Find the exact
1. 3 answers
2. asked by Tiffany Enlow
3. 3,898 views
Use the double angle identities to find sin2x if sinx= 1/square of 17 and cosx<0 . Give exact answer.
1. 3 answers
2. asked by conner
3. 1,378 views
Use the half-angle identities to find all solutions on the interval [0,2pi) for the equationcos^2(x) = sin^2(x/2)
1. 1 answer
2. asked by Nikki
3. 517 views
Use the half-angle identities to find all solutions on the interval [0,2pi) for the equationsin^2(x) = cos^2(x/2)
1. 2 answers
2. asked by Nikki
3. 562 views
Use the identities cos^2 x + sin^2 x =1and cos2x=cos^2 x -sin^2 x to show that cos^4 x -sin^4 x = cos2x Im not sure how, I can
1. 1 answer
2. asked by Anon
3. 560 views
I have tried and tried to understand double angle identities but it just won't stick.if sin x = -0.6 and 180 (degrees) < x < 270
1. 1 answer
2. asked by Kyrie
3. 617 views
1. Power reducing formulas can be used to rewrite 8sin^2 xcos^2 x as 1-cos4x. True or False?2. Find the exact value of cos15
1. 1 answer
2. asked by mysterychicken
3. 1,945 views