Question 1012121
Prove the following:

a) CosA/SecA = CotA
Multiply thru by cos
cos = cos^2/sin
Not an identity.
======================
b)   SinA/1-CosA  =  CscA (1+CosA)
If you mean SinA/(1-CosA)  =  CscA (1+CosA)
Multiply by 1-cos
sin = csc*(1-cos^2)
Multiply by sine
sin^2 = 1 - cos^2
QED