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Prove the identity. cosy cos (x -y) - sin y sin (x-y) = cos x Note that each Statement must be based on a Rule
Prove the identity. cosy cos (x -y) - sin y sin (x-y) = cos 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. Statement Rule cosy cos (x - y) - siny sin (x - y) cos sin tan = Select Rule cot sec csc Validate X 5
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