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OpenStudy (anonymous):
how do i solve sin 2φ, cos 2φ, tan 2φ using cos φ = 3/5 with 0° < φ < 90°?
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zepdrix (zepdrix):
Hey rose :) Hmm
zepdrix (zepdrix):
We'll have to make use of our Double Angle Identities. Oh, before we do that, let's set up a triangle with the given information.
zepdrix (zepdrix):
|dw:1449117758530:dw|
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