1-cos^2 a + tan^2 a * cos^2 a

**dzein** · October 11th 2009, 07:34 AM

Hello,
I can't find functions for $1-cos^2 {\alpha} + tan^2 {\alpha} * cos^2 {\alpha}$
I found that $1-cos^2 {\alpha} = sin^2 {\alpha}$
But where i can find functions for $tan^2 {\alpha} * cos^2 {\alpha}$ ?

Thanks.

**galactus** · October 11th 2009, 07:40 AM

$sin^{2}(a)+\frac{sin^{2}(x)}{cos^{2}(x)}\cdot cos^{2}(a)=2sin^{2}(a)$

**skeeter** · October 11th 2009, 07:42 AM

Originally Posted by dzein

Hello,
I can't find functions for $1-cos^2 {\alpha} + tan^2 {\alpha} * cos^2 {\alpha}$
I found that $1-cos^2 {\alpha} = sin^2 {\alpha}$
But where i can find functions for $tan^2 {\alpha} * cos^2 {\alpha}$ ?

Thanks.

$\tan^2{\alpha} \cdot \cos^2{\alpha} = \sin^2{\alpha}$

**dzein** · October 11th 2009, 07:46 AM

Thankies

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