more FST homework.. radians stuff?

Question

in what intervals between 0 and 2[pi] are cosө and sinө both positive? both negative?

Answer 1

Sine and cosine are both positive in the first quadrant, excluding the endpoints. That interval is (0,π/2).

At 0, sin 0 = 0 is non-negative but not positive.
At π/2, cos(π/2) = 0 is non-negative but not positive.

Both are negative in the third quadrant, excluding the endpoints. That interval is (π,3π/2).

Answer 2

i believe it's b/\2 <----b squared
no not really don't listen to me