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# Trig pls help

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In right triangle $$ABC$$ with $$\angle B = 90^\circ$$, we have $$\sin A = 2 \cos A$$. What is $$\cos A$$?

Feb 5, 2021

#1
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Hello!

sin(a)^2+cosine(a)^2 = 1

(2cosine(a))^2+cosine(a)^2 = 1

I'm sure you can solve it from here.

Good luck. :)))

=^._.^=

Feb 5, 2021