A Level Mathematics Questionbanks

9. a) By using the identities sin2A (2sinAcosA and cos2A (2cos2A 1, show that: i) [4] ii) [3] b) Hence or otherwise solve: sin2 cos2 = sin + cos 0( ( [5] 10. a) Solve the equation cos2x = cosx 0o(x(360o [5] b) Hence write down the solutions to cosx = cosx 0o(x(720o [3] 11. Prove the identity [5] 12. ................
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