Knowing
the number 1:
too could be usefull
1. (cos^2t)/(1-sint)= 1+sint
2. (cot)(x/2)*sinx= 1 + cosx
3. (2cotx)=csc^2x*sin2x
4. (2+2cot^2x)= 2cotxsecxcscx
5. (sinxcosx)=(cosx-cos^3x)/(sinx)
6. 2sinA-cscA=sinA- (cotA)/(secA)
Please help i have no idea how to do these ones... i did about 25 others and cannot for the life of me figure these ones out... please help!!!