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Trig help (1 Viewer)

Thread starter onodostres
Start date May 26, 2012

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onodostres

New Member

#1

How do i prove that sin^4(theta)-cos^4(theta)=sin^2(theta)-cos^2(theta)

A

AAEldar

Premium Member

#2

onodostres said:
How do i prove that sin^4(theta)-cos^4(theta)=sin^2(theta)-cos^2(theta)

$\sin^4\theta - \cos^4\theta$

$=(\sin^2\theta - \cos^2\theta)(\sin^2\theta + \cos^2\theta)$

$=\sin^2\theta - \cos^2\theta$

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