WHICH EXPRESSION IS EQUIVALENT TO SIN 22 COS 18 + COS 22 SIN 18?

asked Feb 5, 2015 97.5k views

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by Chili

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6 votes

Answer:

find the exact value using trigonometric identities 0.6427876

Explanation:

Denis Mazourick answered Feb 6, 2015

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3 votes

$sin(\alpha+\beta)=sin\alpha cos\beta+cos\alpha sin\beta\\\\sin22^ocos18^o+cos22^osin18^o=sin(22^o+18^o)=sin40^o\approx0.6428$

FlashMark answered Feb 9, 2015

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