question of trigonometry
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That's all. veowfkwlwbsbs
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Step-by-step explanation:
4sina sin2a+1-2sin2a=2sina
=8sin^2acosa+1-4sinacosa=2sina
=4sinacosa(2sina-1)=2sina-1
=sinacosa=1/4
=4sina(1/4cosa)=1
=sina/cosa=1
=sina=cosa
then angle a is 30 or 60
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