Hint:

If sin x is positive, then x can be in the 1st and 4th quadrants. If tan x is negative, x can be in the 2nd and 4th quadrants.

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- August 3rd 2008, 07:46 AM #1

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- August 3rd 2008, 07:57 AM #2

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- August 3rd 2008, 10:58 AM #5

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