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10 cards from this deck
Understand which trig functions are involved.
Rearrange to get all trig functions on one side.
sin2θ+cos2θ=1\sin^2\theta + \cos^2\theta = 1sin2θ+cos2θ=1.
θ=sin−1(k)+360°n\theta = \sin^{-1}(k) + 360°nθ=sin−1(k)+360°n or θ=180°−sin−1(k)+360°n\theta = 180° - \sin^{-1}(k) + 360°nθ=180°−sin−1(k)+360°n.
u=−b±b2−4ac2au = \frac{-b \pm \sqrt{b^2-4ac}}{2a}u=2a−b±b2−4ac
θ=θ0+180°n\theta = \theta_0 + 180°nθ=θ0+180°n.
Verify by substituting back into the original equation.
Angles formed by the sum or difference of two angles.
Find 3θ3\theta3θ, then divide by 333.
Check for extraneous solutions.
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