Trigonometry
Simplify the given trigonometric expression.
(1+cotx)2−2cotx\left(1+\cot x\right)^2-2\cot x(1+cotx)2−2cotx
1+cot2x+4cotx1+\cot^2x+4\cot x1+cot2x+4cotx
1+cot2x−4cotx1+\cot^2x-4\cot x1+cot2x−4cotx
csc2x\csc^2xcsc2x
1−cot2x1-\cot^2x1−cot2x