Answer:
(cos^2(x)-1) cot (-x); last expression.
Step-by-step explanation:
You'll first need to simplify the given expression. Then look at each option. To find out whether or not two expressions are equivalent see if they have the same value irrespective of the value of the variables in them.
1) (1-cos^2(x)) cot (-x) is equivalent
2) (cos^2(x)-1) cot(x) is equivalent
3) (sin62(x)-10 tan (x) is equivalent
4) (cos^2(x)-1) cot (-x) is not equivalent.
