Question

cos(π/6)

Answer 1

What do you have to do with that? Find the exact answer?

Answer 2

cos(30)=1/2

Answer 3

no i can type into a calculator and get the exact answer but i need to do it on paper so that it equals to radical 3/ 2

Answer 4

no @rathanreddy that would be the sin(30)

Answer 5

@rathanreddy, that's not correct

Answer 6

ya root 3/2

Answer 7

what i need help with is how to solve it algebraically

Answer 8

I don't think there's a computational process to this @hellysos. You just have to memorize the unit circle.

Answer 9

However, it is easier to simplify if you let pi = 180, then you know 30 is the angle.

Answer 10

i figured that, my professor suggested relating the angles to triangles and solving them with the pythagorean theorem

Answer 11

Actually, you can probably use right trangles to do it.

Answer 12

if i use triangles then 1^2 +1^2= 2

Answer 13

and that is not radical 3/2

Answer 14

so im at a stump

Answer 15

You just have to figure out the ratio of the sides. If you have a right triangle, with theta = 30 degrees then: