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5 sin2 x +3 sin x —2 = 0. (2) (b) Hence solve, for 0 < x < 3600, the equation 5 cos2 x = + sin x), giving your answers to 1 decimal place where appropriate. (5) DC 23 ... cos 2x = —0.9, giving your answers to 1 decimal place. (4) a 05.8 q 1 (a) Show that the equation 4 sin2 x + 9 cos x — 6 — o can be written as ................
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