The problem: prove that

I am not sure how you "prove" this.

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- February 19th 2011, 08:13 PMskyd171Proof that two trig functions = Pi/2
The problem: prove that

I am not sure how you "prove" this. - February 19th 2011, 08:21 PMmr fantastic
- February 19th 2011, 08:30 PMskyd171
Thanks.

- February 19th 2011, 08:52 PMProve It
- February 20th 2011, 04:22 AMHallsofIvy
Now that's going to confuse a lot of people, Prove It!

More generally, tan and cotan, sin and cos, sec and csc "swap" complementary angles. That is, if and are the two non-right angles in a right triangle, then [tex]tan(\theta)= cot(\phi), , [tex], and . And, of course, those two angles add to (did I get it right, Prove It?). - February 20th 2011, 04:35 AMProve It