Yes, thank you. I have already solved it this way. My textbook had an error in the solutions sheet. They just solved the double inequality and did not exchange the increase and decrease intervals.
Hi everyone.
Could anyone help me solve this. I need to find the increase and decrease intervals of f(x) = sin(-3x).
The increase intervals of sin(x) are -\pi/2 + 2\pi*k < x < \pi/2 + 2\pi*k
Is the following the right way to solve my problem (for increase intervals)? -\pi/2 + 2\pi*k < -3x <...