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cos2x-sin2x=1-2sin2x

label Calculus
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How do I verify trignometric identies of the above problem?

Oct 21st, 2017

cos^2x - sin^2x = cos 2x   according to the Double Angle identity

1 - 2sin^2x = cos 2x  also according to the Double Angle identity

therefore,

cos 2x = cos 2x   It checks!

Apr 21st, 2015

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Oct 21st, 2017
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Oct 21st, 2017
Oct 22nd, 2017
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