Question

show that (tan^2 tita ) (1_sin tita) (1+sin tita) =1

Answer 1

Consider LHS
The question you have provided seems to be inocorrect. 

But it should be 

(1+Tan²∅)(1-Sin∅)(1+Sin∅)
(1+Tan²∅)(1-Sin²∅)
(Sec²∅)(Cos²∅)
=1