how to solve thiss???? cos 3x - cos x - sin 3x - sin x

[pikapikh]

cos 3x - cos x - sin 3x - sin x

Can anybody help me to solve this? pls? SOS!

 

[galactus]

Solve what?. What are you to do?. There is no equation.

 

[fasteddie65]

Maybe you are asked to simplify this expression.

You can use the Sum-to-Product Identities: sin A + sin B = 2 sin ((A + B)/2) cos ((A - B)/2), for example.

sin 3x + sin x = 2 sin 2x cos x

 

[pikapikh]

Thanks for replying, I have done it anyway. Thanks, appreciated