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12 cards from this deck
Trig functions of 2θ2\theta2θ in terms of θ\thetaθ
2sin(θ)cos(θ)2\sin(\theta)\cos(\theta)2sin(θ)cos(θ)
cos2(θ)−sin2(θ)\cos^2(\theta) - \sin^2(\theta)cos2(θ)−sin2(θ)
2cos2(θ)−12\cos^2(\theta) - 12cos2(θ)−1
1−2sin2(θ)1 - 2\sin^2(\theta)1−2sin2(θ)
Three
2tan(θ)1−tan2(θ)\frac{2\tan(\theta)}{1 - \tan^2(\theta)}1−tan2(θ)2tan(θ)
Sine sum identity
Pythagorean: sin2θ+cos2θ=1\sin^2\theta + \cos^2\theta = 1sin2θ+cos2θ=1
Simplifying, solving equations, calculus, physics
May lose solutions
Factor common terms
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