Math, asked by vadlakondasirish, 2 months ago

show that cos⁴ teta -sin⁴ teta =cos 2 teta

Answers

Answered by nischalgurung

0

Step-by-step explanation:

(cos theta)^4-(sintheta)^4

=((costheta)^2+(sintheta)^2)×(costheta^2-sintheta^2)

=1+cos2theta

=2costheta^2

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