1.

If `int _(0)^(pi//2) sin^(6) dx = (5pi)/32 ,` then the value of ` int _(-pi)^(pi) (sin ^(6) x + cos^(6)x)dx` isA. `(5pi)/8`B. `(5pi)/16`C. `(5pi)/2`D. `(5pi)/4`

Answer» Correct Answer - D
Let `int_(-pi)^(pi)(sin^(6)x+cos^(6)x)dx`
`=2int_(0)^(pi)(sin^(6)x+cos^(6)x)dx`
`=4int_(0)^(pi//2)sin^(6)x dx+4int_(0)^(pi//2)cos^(6)((pi)/(2)-x)dx`
`8int_(0)^(pi//2)sin^(6)xdx=8xx(5pi)/(32)=(5pi)/(4)" [given]"`


Discussion

No Comment Found