A Level Mathematics Questionbanks
maximum when cos 2x = -1; minimum when cos2x=1 maximum at x=90; minimum at x = 180 A1 (both) [3] 15 a) 2(1 sin2x) + sinx = 1 M1. 2sin2x sinx 1 = 0 A1. sinx = - or 1 A1 ft. x = 210, 330, 90 A2 (-1eeoo) [5] ................
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