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I need help on part 2 Establish the identity. Cos U secu - sin zu = cos 2u Write the left side term sec u

I need help on part 2

Establish the identity. Cos U secu - sin zu = cos 2u Write the left side term sec u in term of cos u. COS U . - sin 2u cos u Simplify the expression from the previous step by canceling the common factor. - sin 2u cos u

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