Question

general solution for cos theta = - root 3 ÷ 2​

Answer 1

Answer:

theta = cos^-1(-√3/2)=150° (answer)

Answer 2

Cos theta = cos Alpha

so general solution will be

theta = 2nπ + alpha

but here cos theta = - √3/2

we know that cos 30° = (-√3/2)

And we also know that

cos(-theta) = costheta

so general solution will be

cos theta = cos 30° = cos π/6

theta = 2nπ + π/6

Hope it helps uh!