If `u _(n) = int _(0) ^(pi//2) x ^(n) sin x dx, n in N` then the value of `u _(10) + 90 u _(s) ` is

If u_(n) = int_(0)^(pi/2) x^(n)sinxdx , then the value of u_(10) + 90 u_(8) is : (a) 9(pi/2)^(8) (b) (pi/2)^(9) (c) 10 (pi/2)^(9) (d) 9 (pi/2)^(9)

If u_(10)=int_(0)^(10)x^(10)sin xdx, then the value of u_(10)+90u_(8) is :

If u_(n)=int_(0)^((pi)/(2))x^(n)sin xdx then u_(10)+90u_(8) is equal to

If U_(n) = int_0^(pi/4) tan^(n) x dx then u_(n)+u_(n-2) =

If n is odd then int_(0)^(pi//2)sin^(n)x dx is

If u_(n) = cos^(n) alpha + sin^(n) alpha , then the value of 2 u_(6) - 3 u_(4) +1 is :