1.

Write the value of\(cos^{-1}(cos\frac{14\pi}{3})\).

Answer»

Given cos-1 (cos 14π/3) 

= cos-1 [cos (4π + 2π/3)] 

= cos-1 (cos 2π/3) 

= 2π/3 

∴ cos -1 (cos 14π/3) = 2π/3



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