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10 questions from this quiz
Multiple angles and double-angle identities
2sinθcosθ2\sin \theta \cos \theta2sinθcosθ
2cos2θ−12\cos^2 \theta - 12cos2θ−1
12[cos(A−B)−cos(A+B)]\frac{1}{2}[\cos(A-B) - \cos(A+B)]21[cos(A−B)−cos(A+B)]
θ=θ0+180∘n\theta = \theta_0 + 180^\circ nθ=θ0+180∘n
Substitution (e.g., u=sinθu = \sin \thetau=sinθ)
When squaring both sides of an equation
a2+b2\sqrt{a^2 + b^2}a2+b2
ba\frac{b}{a}ab
sinAcosB+cosAsinB\sin A \cos B + \cos A \sin BsinAcosB+cosAsinB
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