These formulas are found from taking the square root of the power reduction formulas and substitute for 0 sin = ±₁ tan 1-cose 2 COS 0 1- cos 0 sin 0 The tangent half angle formulas can be found by taking the quotient of the half-angle formulas of sine and cosine, then rationalize the numerator or denominator. tan |= ±₂ 1+ cos 0 2 0 (₁ sin 1+ cos 0 99 A If cos A = with 270°

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A: Let's find single trig function with no fractions.

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A: Ans is given below

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Q: Give the exact value of sin(20).

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