Question
In Problems $37-54,$ use Fundamental Identities and/or the Complementary Angle Theorem to find the exact value of each expression. Do not use a calculator.$$\sin ^{2} 20^{\circ}+\cos ^{2} 20^{\circ}$$
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Step 1: We are given the expression $\sin ^{2} 20^{\circ}+\cos ^{2} 20^{\circ}$. Show more…
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