MHB Is Integrating 4cos(3x) the Same as 12cos(x)?

[tmt1]

$ \displaystyle{ \int { 4 \cos(3x) } \,dx } $ .

Hi,

for this problem, is this the same as 12*cos*x?

Thanks,

 

[Jameson]

Hi tmt,

Nope, that's not true. You can't multiply through like that with trig functions. Start with it this way...

What is $$\int \cos(x)dx$$?

What is $$\int \cos(3x)dx$$?