Use the cosine of a sum and cosine of a difference identities to find cos (s...

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Use the cosine of a sum and cosine of a difference identities to find cos (s + t) and cos (s-t). 4 5 sin s= - lo and sint = s

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Answer 1

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Coss - sin s= 4/5 sint = 윰 [21] (21 - S 21 cost = -12 13 cos (stt) = cos(s) cost) - sin(s) sinlt) = (-)-(-) -35+ che - - 36 6

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