Question

Find the value of a^2-b^2 if a=3cosec.and b=3cot

Answer 1

(3cosec)^2 = 9cosec^2-9cot^2

9(1/sin^2-cos^2/sin^2)

9(1-cos^2/sin^2)

9(sin^2/sin^2)

9(1)

9