Prove the identity. sin (x -y) = tanx - tany cosx cosy Note that each Statement must be based on a Ru a Rule, select the More Information Button to the right of the Rule. Select the Rule X O Algebra Statement O Reciprocal sin (x - y) Select the Rule tan COSx COSy O Quotient csc = O Pythagorean Validate O Odd/Even O Double-angle O Sum and Difference Explanation Check