1.

`int_0 ^(pi/4) sqrt(1+ sin 2x) dx`A. `0`B. `1`C. `2`D. `sqrt(2)`

Answer» `I=int_(0)^(pi//4)sqrt(cos^(2)x+sin^(2)x+2sinxcosx)dx=int_(0)^(pi//4)(cosx+sinx)dx`
`=[sinx-cosx]_(0)^(pi//4)=1`.


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