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cos2x-sin2x=1-2sin2x

Calculus
Tutor: None Selected Time limit: 1 Day

How do I verify trignometric identies of the above problem?

Apr 21st, 2015

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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