Question

to prove and fill this ​

Answer 1

Step-by-step explanation:

LHS= (1+cot²∅)(1-cos∅)(1+cos∅)

=(1+cot²∅)×[(1)²-cos²∅]

= cosec²∅×sin²∅

= 1/sin²∅ × sin²∅

=1

= RHS

formulas used

(a-b)(a+b)= a²-b²

1-cos²∅= sin²∅

Cosec²∅= 1/sin²∅