A Level Mathematics Questionbanks
[3] c) sin2 ( 2sin cos B1. sin22 ( 4sin2 cos2 M1. cos2 ( 1 sin2 M1 (a 2)2 = 4b2(1 b2) A1 ... 2cos2x 1=cosx B1 (2cosx + 1)(cosx 1) = 0 M1 A1. cosx = - or 1. x = 120, 240, 0 A2 (-1 eeoo) [5] b) From a), have x … ................
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