A Level Mathematics Questionbanks

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. a) Show that 2cos (x 45) = (2(cosx + sinx) [3] b) Hence solve the equations. i) cosx + sinx = 1 0(x ................
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