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Can some one help me with this : sin^4a+cos^4a+2sin^2acos^2a=1

Quote: Originally Posted by zotikamaliqi Can some one help me with this : $\displaystyle \sin^4(a)+\cos^4(a)+2\sin^2(a)\cos^2(a)=1$ $\displaystyle \sin^4(a)+\cos^4(a)+2\sin^2(a)\cos^2(a)=(\sin^2(a) +\cos^2(a))^2$