Question

Evaluate cos⁻¹ ($\frac{1}{\sqrt{2}}$)

Answer 1

Hi Mate!!

Let x = Cos^-1 ( 1 / √2 )

=>. Cos ( x ) = 1 / √2

=>. Cos ( x ) = Cos ( π / 4 )

=>. x = 2nπ +- π / 4 ....( It's general solutions)....


x = π / 4