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Trigonometry
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OpenStudy (anonymous):
can anyone verify if I did this right? use algebra to verify the following trig identity. siny sin2y + cosy cos2y=cosy siny (2siny cosy) + cosy (1-2sin^2y)=cosy 2sin^2y cosy + cosy - 2sin^2y cosy cos y=cos y
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OpenStudy (anonymous):
yup
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