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    (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.
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    (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?
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    (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.
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    All science teachers are crazy, I tell you.
 
 
 
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Updated: February 26, 2016
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