TMUA 2016 Paper 1 Q17 — Worked Solution

P1·Trigonometry, Inequalities·6.5Official · 2016 · Q17

product-of-trigsign-analysisinterval-union

It is given that

y = (1 + 2 cos x) cos 2 x

for

0 < x < π

. The complete set of values of

x

for which

y

is negative is

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