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10 cards from this deck
Trig functions in quadratic form (sin2θ\sin^2\thetasin2θ, cos2θ\cos^2\thetacos2θ, tan2θ\tan^2\thetatan2θ)
a(trig)2+b(trig)+c=0a(\text{trig})^2 + b(\text{trig}) + c = 0a(trig)2+b(trig)+c=0
Factoring, quadratic formula, substitution
Let u=u =u= trig function and substitute
Back-substitute uuu with original trig function
Between −1-1−1 and 111
0∘0^\circ0∘ to 360∘360^\circ360∘ or 000 to 2π2\pi2π radians
sin2(θ)\sin^2(\theta)sin2(θ)
cosθ\cos\thetacosθ must be between −1-1−1 and 111
90∘90^\circ90∘
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