1.

Evaluate each of the following:tan-1(tan \(\frac{6\pi}7\))

Answer»

Tan\(\frac{6\pi}7\) can be written as tan\((\pi-\frac{\pi}7)\)

tan\((\pi-\frac{\pi}7)\) = –tan\(\frac{\pi}7\)

∴ As, tan–1(tan x) = x

Provided x ϵ \((\frac{-\pi}2,\frac{\pi}2)\)

tan –1(tan\(\frac{6\pi}7\)) = –\(\frac{\pi}7\)



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