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# period of sin x watch

1. (Original post by Alen.m)
well in that case pi/2-o will be the solution as well isn't or 3pi/2-o
No. Watch the video, refresh your cast diagram. The diagram shows that it's either angle, pi-angle, pi+angle, or 2pi-angle.
2. (Original post by Zacken)
Like I said, when it's 0 - then all four quadrants apply.
thanks mate managed to find the answers using cast diagram . just one last question for any trig function equal to zero all quadrants will apply or only for sin?
3. (Original post by Alen.m)
thanks mate managed to find the answers using cast diagram . just one last question for any trig function equal to zero all quadrants will apply or only for sin?
All trig functions.
4. All science teachers are crazy, I tell you.

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