Posted by Tom on Thursday, April 10, 2008 at 9:17pm.
1. (sinx/cscx)+(cosx/secx)=1
2. (1/sinxcosx)(cosx/sinx)=tanx
3. (1/1+cos s)=csc^2 scsc s cot s
4. (secx/secxtanx)=sec^2x+secxtanx
5. (cosx/secx1)(cosx/tan^2x)=cot^2x

math (#1 of 6)  drwls, Friday, April 11, 2008 at 1:30am
sinx/cscx is the same thing as sin^2 x
cosx/secx is the same thing as cos^2 x
What you you know about the sum of sin^2 and cos^2 ?
Try proving the other identities yourself, writing tan, csc and sec in terms of sin and cos.