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If t a n(pi//4+theta)+t a n(pi//4-theta)...

If `t a n(pi//4+theta)+t a n(pi//4-theta)=a ,` then `t a n^2(pi//4+theta)+t a n^2(pi//4-theta)` = (a) `a^2+1` (b) `a^2+2` (c) `a^2-2` (d) none of these

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