how do u do

evaluateL

cos135

To evaluate cos(135), we can use a mathematical calculator or apply the trigonometric identity.

Using a calculator:
1. Open a math calculator on your computer or smartphone.
2. Look for the "cos" or "cosine" function.
3. Enter the angle measurement in degrees. In this case, enter "135".
4. Press the "equals" or "calculate" button.
5. The calculator will display the result.

Using the trigonometric identity:
1. Convert the angle from degrees to radians. To convert degrees to radians, multiply by π/180.
135° * (π/180) = (3π/4) radians.
2. Use the cosine function with the converted angle.
cos(3π/4) = -√2/2.
Since the angle is in the second quadrant, where cosine is negative.

So, cos(135) is equal to -√2/2 or approximately -0.707.