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OpenStudy (anonymous):
complete the identity cos (pi/2 + x)
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OpenStudy (cwrw238):
cos(a + b) = cos a cos b - sin a sin b
OpenStudy (anonymous):
so would that leave me with just sin x ?
OpenStudy (anonymous):
er -sin x
OpenStudy (cwrw238):
cos pi/2 = 0 sin pi/2 = 1
OpenStudy (cwrw238):
right - sin x
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