# trigonometry

• November 26th 2012, 03:24 AM
zotikamaliqi
trigonometry
Can some one help me with this :

sin^4a+cos^4a+2sin^2acos^2a=1
• November 26th 2012, 03:31 AM
Plato
Re: trigonometry
Quote:

Originally Posted by zotikamaliqi
Can some one help me with this :

$\sin^4(a)+\cos^4(a)+2\sin^2(a)\cos^2(a)=1$

$\sin^4(a)+\cos^4(a)+2\sin^2(a)\cos^2(a)=(\sin^2(a) +\cos^2(a))^2$