Actually, I just need help with finding the other X

I know the answer is 2pi, but how do I find this without using a graphic calculator?

>>148183

2pi/3*

can you use a scientific calculator? ti36x pro has a general equation solver that you can use to get both values, just tried it
otherwise you could just try plugging in values from the unit circle until you get to 0, doubt it'd take too long

>>148183
>>148184
remember, the sine function oscillates.

if you recall from the instructions on step 2 ,the derivative of a continuous function is 0 when the function's rate of change goes from + to - OR - to +. because you already found pi/3 as a solution the other solution must be obvious, especially given the constraint on X and knowledge of the sine function