Question

solve this ques with full steps

Answer 1

here is the answer...

Answer 2

as cos A/ sin A =tan A/cos A
cot A= tan A/ cos A
cos A=tan A/cot A
cos A= sin^2/cos^2
cos A = tan^2

now
cos^3+cos^2
cos^2(cos +1)
cos^2(tan^2+1)
cos^2*sec^
=1