Trigonometry Examples

$\cos (531) \cos (216) + \sin (531) \sin (216)$

Step 1

Remove full rotations of $360$ ° until the angle is between $0$ ° and $360$ °.

$\cos (171) \cos (216) + \sin (531) \sin (216)$

Step 2

Remove full rotations of $360$ ° until the angle is between $0$ ° and $360$ °.

$\cos (171) \cos (216) + \sin (171) \sin (216)$

Step 3

The result can be shown in multiple forms.

Exact Form:

$\cos (171) \cos (216) + \sin (171) \sin (216)$

Decimal Form:

$0.70710678 \dots$