trignometry

tanx+cotx=5 than find the value of tan^2x+cot^2x

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  1. well, recall that

    (tanx + cotx)^2 = tan^2x + 2tanx*cotx + cot^2x

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  2. tanx+cotx=5 then tan^2 x +cot^2 x=?
    ans:
    25

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