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actually cos is defined as adjacent side by hypotenuse so opposite side will be 5 and from that u can find all the trigonometric ratios that in quadrant 3 only tan and cot are positive so these will be positive in values remaining are of negative
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hey mate I have done the 10 nd 11 no question..12 and 13 are same as 10 and 11. But careful when u don this sum please check the quadrant what is given in the question...Try from urself...u can...
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