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The Integral int(pi/4)^((3pi)/4)(dx)/(1+...

The Integral `int_(pi/4)^((3pi)/4)(dx)/(1+cosx)` is equal to:

A

`-1`

B

`-2`

C

`2`

D

`4`

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To solve the integral \[ I = \int_{\frac{\pi}{4}}^{\frac{3\pi}{4}} \frac{dx}{1 + \cos x} \] we can use a symmetry property of definite integrals. ...
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