Prove the identity. cosinx} + = cotx , n + . cos. x , _ 2 ,. Note that each Statement must be based on a Rule chosen from the Rule menu. To see a detailed description of a Rule, select the More Information Button to the right of the Rule. 0 Algebra 0 Reciprocal O Quotient : O Pythagorean Select the Rule 0 Oddmven Validate 0 Evaluation 0 Sum and Difference