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9. Rewrite cos(tan 1 w) as an algebraic expression in w. COS = 1 Tan -1w 10. Prove the identity 1 COS X = tan

9. Rewrite cos(tan 1 w) as an algebraic expression in w. COS = 1 Tan -1w 10. Prove the identity 1 COS X = tan x COs x 1 + sin x sinx Tanx

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