1.

`int_(0)^(pi//2)sqrt(1+cos2x)dx=?`A. `sqrt(2)`B. `(3)/(2)`C. `sqrt(3)`D. `2`

Answer» `I=int_(0)^(pi//2)sqrt(2cos^(2)x)dx=sqrt(2)int_(0)^(pi//2)cosxdx=sqrt(2)[sinx]_(0)^(pi//2)=sqrt(2)`.


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