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मान लीजिए` x = 4 tan^(-1)(1/5) , y = tan^(-1) (1/70)` और ` z = tan^(-1)(1/99)` है । x - y + z किसके बराबर है ?A. ` pi/2`B. `pi/3`C. ` pi/6`D. ` pi/4`

Answer» Correct Answer - D
` x - y + z = tan^(-1)((8281)/(8450))+tan^(-1)(1/99)`
` = tan^(-1) ((828269)/(828269)) = pi/4`


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