express cos in terms of tan
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Tan=Sina/cosa
squaring both the sides
tan^2a=(1-cos^2a/cos^2a)
tan^2a=(1/cos^2a)-(1)
tan^2a+1=(1/cos^2a)
Cosa=1/√[tan^2a+1]
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1.) cos 2A = cos² A - sin² A
2.) cos 2A = cos² A (1 - tan² A)
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