Use identities to find (a) sin 20 and (b) cos 20. Do not use a calculator. tan 0 = 2 and cos 0 <0 (a) sin 20= (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.) (b) cos 20= (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.)

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