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March 28, 2015

March 28, 2015

Posted by **Anonymous** on Sunday, August 12, 2012 at 3:16pm.

Prove that tan^2(alpha)-1+cos^2(alpha)=tan^2(alpha)sin^2(alpha)

- Trigonometry -
**Steve**, Sunday, August 12, 2012 at 3:26pmsince cos(-x) = cos(x), what do you think?

cos(-x) = cos(0-x)

= cos0*cosx - sin0*sinx

= 1*cosx - 0

= cos(x)

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