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Use the double angle identities

How do you express sin4x as a trigonometric funcition of x using the identities? I think that you are supposed to start with the
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2. asked by Taylor
3. 2,498 views
Solving Trig Functions: How Do You Solve For Sin 7.5 Using Half-Angle and Double-Angle Identities?
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2. asked by Spy[c]
3. 661 views
sin2x-cotx = -cotxcos2xUsing the various trigonometric identities(i.e. double angle formulas, power reducing formulas, half
1. 3 answers
2. asked by sam
3. 2,144 views
Use your knowledge of the half-angle and double-angle identities to simplify the following(4sin(2a))-(2sin(2a))(4sin^2(a))
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2. asked by Addi
3. 497 views
A coil of wire rotating in a magnetic field induces a coltage E=20sin((PIa/4) - (PI/2)). Use an identity to express this in
1. 4 answers
2. asked by Blake
3. 1,210 views
Use the double angle identities to find sin2x if sinx= 1/square of 17 and cosx<0 . Give exact answer.
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2. asked by conner
3. 1,357 views
1) Use double-angle identities to write the following expression, using trigonometric functions of x instead of 4x.cos 4x 2) Use
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2. asked by CHEYANNE
3. 576 views
1) Use double-angle identities to write the following expression, using trigonometric functions of x instead of 4x.cos 4x 2) Use
1. 1 answer
2. asked by marie
3. 665 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
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2. asked by Kyrie
3. 606 views
Verify that following are identities:1. cos 3t = 4 cos³ t-3 cos t 2. sin 4x = 8 sin x cos³ x-4 x cos x (use a double-angle
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2. asked by PDF
3. 733 views