Please somebody ans this

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LHS= Sec^6(x)= (1+tan^2x)^3= 1+tan^3(x) + 3tan^2(x)*(1+tan^2(x) =1+tan^3(x) + 3tan^2(x). Sec^2(x) = RHS
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rhs .a
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RHS IS THE ANSWER
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Give question??
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