How is this wrong?
I got PFs at pi, 1.823, and 4.46 with concave up: (1.823, pi) (4.46, 2pi) and concave down: (0, 1.823) (pi, 4.46)
Yeah sorry, the original equation was 2sin(x)+sin(2x)
- StephenLv 44 weeks ago
For x=0, the graph has gradient = 0.
But your step 2 gives gradient = 2cos(0) + 2cos(2*0) = 4.
So you've probably made a mistake going from step1 (starting equation) to step 2.
- Steve4PhysicsLv 74 weeks ago
I agree with your answer. Are you entering answers into software? Maybe it's the format that's wrong.