Question

(1−cosθ)(1+cosθ)(1+cot2θ)=​

Answer 1

Answer:

(1-cos theeta)(1+cos theeta)(1+cos2 theeta)

=(1-cos^2theeta)(sin^2 theeta+cos^2theeta+cos^2 theeta-sin^2 theeta)

=sin^2 theeta.2 cos^2 theeta

=2sin^2 theeta. cos^2 theeta

=sin^2 2 theeta/2