A-Level
EDEXCEL
Mathematics & Further Mathematics
May 2017
QP-201705-Mathematics-C34 · Question 7
Question (excerpt):
20 7. (a) Prove that 1 2 1 2 − + cos cos x x ŁWDQ2 x, x z(2n + 1)90°, n ' (3) (b) Hence, or otherwise, solve, for –90° ș 90°, 2 2cos2 1 cos2 θ θ − + – 2 = 7secș Give your answers in degrees to…
20 7. (a) Prove that 1 2 1 2 − + cos cos x x ŁWDQ2 x, x z(2n + 1)90°, n ' (3) (b) Hence, or otherwise, solve, for –90° ș 90°, 2 2cos2 1 cos2 θ θ − + – 2 = 7secș Give your answers in degrees to…
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