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1 Unit 1: Pure Mathematics A

Show that the equation $2\sin^2 x = 7\cos x + 5$ can be written in the form $2\cos^2 x + 7\cos x + 3 = 0$

[3]

Hence solve, for $\leqslant x < 360°$ , the equation $2\sin^2 x = 7\cos x + 5$ .

[5]

1 Unit 1: Pure Mathematics A Questions

Show that the equation $2\sin^2 x = 7\cos x + 5$ can be written in the form $2\cos^2 x + 7\cos x + 3 = 0$

[3]

Hence solve, for $\leqslant x < 360°$ , the equation $2\sin^2 x = 7\cos x + 5$ .

[5]