Question

The sign of the which of the following trignometric function will be negative

Answer 1

Step-by-step explanation:

Signs of Trigonometric Functions in Each Quadrant

We know that cosα=xr. Since r>0, the sign of the cosine function depends only on the sign of x. Therefore, the cosine is positive in the 1st and 4th quadrants, and negative in the 2nd and 3rd quadrants