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10 questions from this quiz
2sin(θ)cos(θ)2\sin(\theta)\cos(\theta)2sin(θ)cos(θ)
2tan(θ)1−tan2(θ)\frac{2\tan(\theta)}{1 - \tan^2(\theta)}1−tan2(θ)2tan(θ)
2425\frac{24}{25}2524
−119169\frac{-119}{169}169−119
22.5∘22.5^\circ22.5∘ and 112.5∘112.5^\circ112.5∘
cos(2x)=2cos2x−1\cos(2x) = 2\cos^2 x - 1cos(2x)=2cos2x−1
You lose solutions where cosx=0\cos x = 0cosx=0
Compound angle formulae by setting A=BA = BA=B
π2,7π6,3π2,11π6\frac{\pi}{2}, \frac{7\pi}{6}, \frac{3\pi}{2}, \frac{11\pi}{6}2π,67π,23π,611π
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