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Integrate the functions(1-cosx)/(1+cosx)...

Integrate the functions`(1-cosx)/(1+cosx)`

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`int (1-cos x)/(1+ cos x)dx ` ltb rgt `= int (2sin^(2).(x)/(2))/(2 cos^(2) .(x)/(2))dx= int tan^(2) .(x)/(2) dx`
`=int (sec^(2) .(x)/(2)-1)dx= (tan.(x)/(2))/((1)/(2))-x+c`
` = 2 tan .(x)/(2) - x+ c`
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