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Step-by-step explanation:Dear student
cot (tan^-1 x + cot^-1 x) + cos ^-1 (- (2 x^2 – 1)) + cos ^-1 (2 x^2 – 1)
= cot (\pi/2) + \pi – cos ^-1 (- (2 x^2 – 1)) + cos ^-1 (2 x^2 – 1)
= 0 + \pi – 0
= \pi
Hence proved
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