Question

Plzz ans question no 21

Answer 1

Hope this will help...

Answer 2

Answer:

1/3

Step-by-step explanation:

We know that cosec²θ-cot²θ=1

(3x)²-(3/x)²=1

9x²-9/x²=1

9(x²-1/x²)=1

x²-1/x²=1/9

multiplying both the sides by 3

3(x²-1/x²)=3*1/9

3(x²-1/x²)=1/3

hence proved