Double angle identities answer key - Fort Bend ISD

2. 5—10sin2 x = Given: sin A = — 12 3m cos B 13' 2 6, cos(2A) = 2 25 8. COS(A + B) = ... 10. Simpli$' using the sum and difference identities. 11. cos(8x)cos(2x)—sin(8x)sin(2x) = - COS 3. cos2 sin 2 Angle A 9. sin(A—B)= Angle B -G-----zç 12. = -3-1+6 Use a sum or difference identitv to find the exact valuc. ... 23. 2cos2 x+5cosx—3 ... ................
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