Question: 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?

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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