sin to the power 4 theta plus cos to the power 4 theta equals what?
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sin^4 theta + cos^4 theta
= (sin^2theta )^2 + (2) sin^2theta.cos^2 theta+ (cos^2theta)^2 - 2sin^2theta.cos^2theta
= (sin^2 theta + cos^2 theta)^2 - 2sin^2 theta. Cos^2theta
= 1 - 2 sin^2 theta. cos^2 theta (ans)
Hope this helps :)
= (sin^2theta )^2 + (2) sin^2theta.cos^2 theta+ (cos^2theta)^2 - 2sin^2theta.cos^2theta
= (sin^2 theta + cos^2 theta)^2 - 2sin^2 theta. Cos^2theta
= 1 - 2 sin^2 theta. cos^2 theta (ans)
Hope this helps :)
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