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Find the value of (i) tan (tan^-1 (7π/4)) (ii) tan (tan^-1 (1947)) (iii) tan (tan^-1 (-0.2021))

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Find the value of 

(i) tan (tan-1 (7π/4))

(ii) tan (tan-1 (1947)) 

(iii) tan (tan-1 (-0.2021))

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We know that tan (tan-1 x) = x

(i) tan (tan-1 (7π/4)) = 7π/4

(ii) tan (tan-1 (1947)) = 1947

(iii) tan (tan-1 (-0.2021)) = -0.2021

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