amandaschweitzer amandaschweitzer

14-11-2016
Mathematics

contestada

Verify the identity
Cos^2x-Sin^2x=1-2sin^2x

Respuesta :

cutiepie32 cutiepie32

14-11-2016

From the basic definitions of sin and cos and the Pythagorean Theorem
cos2(x)+sin2(x)=1

or
cos2(x)=1−sin2(x)

So
cos2(x)−sin2(x)

=(1−sin2(x))−sin2(x)

=1−2sin2(x)

hope this helps.

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