Use the cosine of a sum and cosine of a difference identities to find cos (s+t) and cos (st). sin s= 5 13 and sint = - 4 s in quadrant I and t in quadrant III 5 cos (s+t)= (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.) cos (st) = ☐ (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.)

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