Question

Which of the following is correct please?

Answer 1

Answer: Choice A

Reason:

Cosine and sine are positive in quadrant 1, which is when x > 0 and y > 0.

Recall that
`\text{x} = \cos(\theta)` and
`\text{y} = \sin(\theta)`

Quadrant 1 in the northeast corner corresponds to the interval
`0^(\circ) < \theta < 90^(\circ)`