Posted by **Urgh** on Thursday, September 20, 2007 at 12:51am.

Establish the identity:

(1 - cos^2 0)(1 + cot^2 0) = 1

No idea!

- Trigonometry -
**drwls**, Thursday, September 20, 2007 at 2:02am
Let's use x instead of 0 as the angle, to avoid cnfusion with the number zero.

Remember that 1 - cos^2 x = sin^2 x

Also sin^2 x *cot^2 x = sin^2*cos^2/sin^2 = cos^2 x

With those steps, and sin^2 x + cos^2 x = 1, you should be able to prove this identity.

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