High School How to find out various sine values from its graph.

[Phys12]

Question (and Answer):

The answer is written in thin black, inc = increasing, dec = decreasing. Am I wrong anywhere?

Thanks!

 

[.Scott]

I would quibble over pi/2 and 3pi/2. In both of those cases the value of sin(x)neither increases nor decreases as x increases .

 

[mfb]

I would quibble over pi/2 and 3pi/2. In both of those cases the value of sin(x)neither increases nor decreases as x increases .

Same here. Everything else is correct.

 

[Phys12]

I would quibble over pi/2 and 3pi/2. In both of those cases the value of sin(x)neither increases nor decreases as x increases .

Yeah, I also spent more time on those than others. I can see that the derivative there would be a horizontal straight line. Fine, thank you!