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Mathematics 12 Online
OpenStudy (anonymous):

how do i solve sin 2φ, cos 2φ, tan 2φ using cos φ = 3/5 with 0° < φ < 90°?

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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