Question

If cot a is 17/18 evaluate 1 + sin a into 1 minus sin a upon 1 + cos a into 1 minus cos a

Answer 1

(1+SinA)(1-SinA)/(1+CosA)(1-CosA)

=(1-Sin^A)(1-Cos^A)

=Cos^A/Sin^A

=Cot^A

=289/324