Question

What is the exact value of cos theta = squareroot 2 over 2?

Answer 1

ok, so you want us to find theta when
`cos(\theta)=(√(2))/(2)`
we know from our unit circle that when the angle is 45 degrees, cos(45°)=sin(45°)=
`(√(2))/(2)`
also we can find this by the special 45-45-90 triangle


when Θ=45°, cos(Θ)=
`(√(2))/(2)`