Answer:
The answer is a. cos2x - sin2x - sin x. Use the rule: cos2x = (cos^2)x - (sin^2)x. So, substitute cos2x in the expression: cos2x - sinx = ((cos^2)x - (sin^2)x) - sinx = (cos^2)x - (sin^2)x - sinx. Therefore, choice a. is correct choice.
I dont really know the answer but u can use this app called photomath and it will help
Answer:
Step-by-step explanation:
first ask teacher
second be polite
third ask help from your peers
Sum is 180 degrees, always
