Verify the identity .
(cscX-cotX)^2=1-cosX/1+cosX
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sorry i cant help you
(cscX-cotX)=1/sinX - cosX/sinX = (1-cosX)/sinX
If you square this you have (1-cosX)^2/(sinX)^2
Now use (sinX)^2 = 1 - (cosX)^2 to get
(1-cosX)^2 / 1 - (cosX)^2 =
[(1-cosX)*(1-cosX)]/[(1 - cosX)*(1 + cosX)
Then simplify.
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