Trigonometry Examples

Simplify 5cos(90)-8sin(270)
Step 1
Simplify each term.
Tap for more steps...
Step 1.1
The exact value of is .
Step 1.2
Multiply by .
Step 1.3
Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because sine is negative in the third quadrant.
Step 1.4
The exact value of is .
Step 1.5
Multiply .
Tap for more steps...
Step 1.5.1
Multiply by .
Step 1.5.2
Multiply by .
Step 2
Add and .