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OpenStudy (anonymous):
Is Cos (pi/2-theta)=sin theta an identity?
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OpenStudy (anonymous):
I say it is
OpenStudy (anonymous):
but I don't know how to prove it
OpenStudy (welshfella):
draw a right angled triangle
OpenStudy (anonymous):
|dw:1463163835571:dw|
OpenStudy (welshfella):
|dw:1463163831698:dw|
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