What are cos θ and sin θ for θ = 90°, θ =
|
|
|
You can find the exact value of sine and cosine for angles that are multiples of 30° or 45°.
What are the cosine and sine of the angle?
Know | Need | Plan |
---|---|---|
An angle | The x- and y-coordinates of the point where the angle intersects the unit circle |
|
The cosine of 60° is the length of the shorter leg of the triangle. The sine of 60° is the length of the longer leg of the triangle. In a 30°
Draw the angle in standard position to determine the point P(x, y) on the unit circle. P is in the third quadrant so the signs of x and y will be negative. Form a right triangle with hypotenuse 1. In a 45°