Prove the identity. 7r. + cos, x _ 2 , _, = tanx cos._7t+x, 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 Reciprocal Quotient Pythagorean Validate Odd/Even Evaluation Sum and Difference OOOOOO Explanation