(SECα + 1)( SECα - 1)(CSCα + 1)(1 - SINα)
(SECα + 1)( SECα - 1)(CSCα + 1)(1 - SINα)
[(SECα + 1)( SECα - 1)][(CSCα + 1)(1 - SINα)]
=[(TANα)^2]*[(COSα)^2/SINα]
=SINα
(SECα + 1)( SECα - 1)(CSCα + 1)(1 - SINα)
[(SECα + 1)( SECα - 1)][(CSCα + 1)(1 - SINα)]
=[(TANα)^2]*[(COSα)^2/SINα]
=SINα