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campbell_st
 2 years ago
Best ResponseYou've already chosen the best response.0use the substitution sin^2(x) = 1  cos^2(x) and you also need to know sec^2(x) = 1/cos^2(x) so the left hand side becomes 1 + 1/cos^2(x)(1  cos^2(x)) distribute and simplify for your answer
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