\[\int_{{}}^{{}}{\frac{\cos x-1}{\cos x+1}\ dx=}\] [MP PET 1989, 92]

\[\frac{1}{2}\tan \frac{x}{2}-x+c\]

\[x-\frac{1}{2}\tan \frac{x}{2}+c\]

\[\int_{{}}^{{}}{\frac{\cos x-1}{\cos x+1}\ dx=}\] [MP PET

1.	\[\int_{{}}^{{}}{\frac{\cos x-1}{\cos x+1}\ dx=}\] [MP PET 1989, 92]
A.	\[2\tan \frac{x}{2}-x+c\]
B.	\[\frac{1}{2}\tan \frac{x}{2}-x+c\]
C.	\[x-\frac{1}{2}\tan \frac{x}{2}+c\]
D.	\[x-2\tan \frac{x}{2}+c\]
Answer» E.

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\[\int_{{}}^{{}}{\frac{\cos x-1}{\cos x+1}\ dx=}\] [MP PET 1989, 92]

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