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Trig Question

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Matt The Rat:
I was wondering if someone would be able to help out with this question. Thanks in advance! :)

ice_blockie:
Use compound angle formula, rearrange & simplify!

Mao:
(looks like dinner got delayed)

*typing*



using compound angle formula:














I tried a graphical approach first and got absolutely nowhere, i suppose there's times when you just ought to trust algebra.

ice_blockie:
Just one question...where did you get this question from? I haven't seen it before!

Matt The Rat:
Thanks Mao and ice_blockie!

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