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Ibrahim Bishop
Mathematics
8 March, 06:51
If cos x=-4/5, and 180°
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Mira Hardy
8 March, 06:59
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180< x < 270 so x is in 3rd quadrant, hence tan x is positive cos x=-4/5 tan (x/2) = √ { (1 - cos x) / (1 + cos x)) = √ { (1+4/5) / (1-4/5) } = √{ 9/5) / (1/5) } = √9=±3 now ...
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