Question

pls this question. ​

Answer 1

LHS=(1+1/tan^2A)(1+1/cot^2A)

=(1+cot^2A)(1+tan^2A)

=(cosec^2A)(sec^2A)

=(1/sin^2A)(1/cos^2A)

=(1/sin^2A)(1/1-sin^2A)

=1/(sin^2A)(1-sin^2A)

=1/sin^2A-sin^4A=RHS

$proved...$