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October 10, 2015
Posted by **Britney** on Saturday, March 24, 2012 at 11:53am.

cos^2x + tan^2x cos^2x = 1

- Precalculus -
**drwls**, Saturday, March 24, 2012 at 12:01pmtan^x*cos^2x can be replaced with sin^2x, since tan^2x = sin^2x/cos^2x

cos^2 + sin^2x = 1

q.e.d.

- Precalculus -
**Britney**, Saturday, March 24, 2012 at 12:37pmThank you.!