i have this pre-cal assignment..i dont kno any of it!!?

R

Roman

New member
My teacher is having us do som sort of project where we hav to work out 10 of these problems correctly & i just cant get the hang of it! So if anyone could please help me answer just 10 or however many of these problems as you can, you would really be saving my life.
1. cos^2X + tan^2XcosX = 1
2. sec^2X + tan^2Xsec^2X = sec^4X
3. sec^4X - tan^4X = 1 + 2tan^2X
4. secX/sinX - sinX/cosX = cotX
5. sinX/1-cosX + 1-cosX/sinX = 2cscX
6. 1/1-sinX=sec^2X + secXtanX
7. 1+sinX/1-sinX = 2sec^2 + 2secXtanX-1
8. sinX(cscX - sinX) = cos^2X
9. (1-cos^2X)(1+cos^2X) = 2sin^2X - sin^4X
10. sin^2 - 1 = -cos^2X
11. cosX/secX + sinX/cscX = sec^2X - tan^2X
12. 1/tanX-secX + 1/tanX+secX = -2tanX
13. sin^2X/cos^2X = 1
14. cosX/sinXcotX = 1
15. cscX+cotX/tanX+sinX = cotXcscX
16. sin^2X-cos^2X/sinX-cosX = sinX + cosX
17. secX/secX-tanX = sec^2X + secXtanX
18. sin^4X - cos^4 = 2sin^2X - 1
19. csc^2X - cos^2Xcsc^2X = 1
20. cosX(secX - cosX) = sin^2X
21. cotXsinX = cosX
22. 1-cosX/1+cosX = (cotX - cscX)^2
23. 1/1-sinX + 1/1+sinX = 2sec^2X
24. 1/secX-tanX = secX + tanX
25. tanX/1+cosX + sinX/1-cosX = cotX + secXcscX

PLEASE HELP!
 
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