Question: I need help on this question Find the exact value of the expression. Do not use a calculator. sin (77) cos (13) + sin (13)

I need help on this question

I need help on this question Find the exact value of the

Find the exact value of the expression. Do not use a calculator. sin (77) cos (13) + sin (13) cos (77) ..... sin (770) cos (13) + sin (13) cos (77) = (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression. Type an exact answer, using radicals as needed.)

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