Trigonometry Examples

cos (\frac{7 π}{2})

$\cos (\frac{7 π}{2})$

Step 1

Subtract full rotations of

2 π

$2 π$ until the angle is greater than or equal to

0

$0$ and less than

2 π

$2 π$ .

cos (\frac{3 π}{2})

$\cos (\frac{3 π}{2})$

Step 2

Apply the reference angle by finding the angle with equivalent trig values in the first quadrant.

cos (\frac{π}{2})

$\cos (\frac{π}{2})$

Step 3

The exact value of

cos (\frac{π}{2})

$\cos (\frac{π}{2})$ is

0

$0$ .

0

$0$