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Can you help me answer number 18 please? 18. (151) If cos(-a) = , use your knowledge of trig identities (not a calculator) to find

Can you help me answer number 18 please?

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18. (151) If cos(-a) = , use your knowledge of trig identities (not a calculator) to find seca + cosa. A VIN NIUI B. D. 0 E. None of the above

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