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here sinx=-3/5,cosx=-4/5,tanx=3/4,cotx=4/3
cosx=1-2cos²x/2
-4/5=1-2cos²x/2
-4/5-1=2cos²x/2
-9/5=2cos²x/2
-9/10=cos²x/2
cosx/2=√9/10
sinx=2×sin x/2× cosx/2
-3/5=2×sinx/2×√9/10
-3/10×√10/9=sinx/2
-3/√10×9=sinx/2
-27/√10=sinx/2
tanx/2=(sinx/2)/(cosx/2)
tanx/2=(-27/√10)/√9/√10
tanx/2=-27/√9
finally sinx/2=-27/√10,tanx/2=-27/√9,cosx/2=√9/√10
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