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OpenStudy (anonymous):
write function in terms of its cofunction... sin (alpha + 20 degrees) = cos...
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OpenStudy (kc_kennylau):
\[\begin{array}{rl}\sin(90-\theta)&=&\cos\theta\\\sin\theta&=&\cos(90-\theta)\end{array}\]
OpenStudy (kc_kennylau):
You can use either formula, but I would recommend the second
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