# Hard problem with integrals

#### Tom1234

known
F(x)=int(f(arcsin(x)dx)
find
int(f(x)*cos(x)dx) between 0 to Pi
thought of t=sin(x) but i can only integrate for 0 to Pi/2...

#### Opalg

MHF Hall of Honor
known
F(x)=int(f(arcsin(x)dx)
find
int(f(x)*cos(x)dx) between 0 to Pi
thought of t=sin(x) but i can only integrate for 0 to Pi/2...
It looks to me as though you have spotted an error in this question. The "known" function F(x) only provides information about f(t) in the interval $$\displaystyle |t|\leqslant \pi/2$$. So you know nothing about f(x) for $$\displaystyle x>\pi/2$$ and therefore there is no way that you can describe its integral in the interval $$\displaystyle [\pi/2,\pi]$$.

#### Tom1234

It looks to me as though you have spotted an error in this question. The "known" function F(x) only provides information about f(t) in the interval $$\displaystyle |t|\leqslant \pi/2$$. So you know nothing about f(x) for $$\displaystyle x>\pi/2$$ and therefore there is no way that you can describe its integral in the interval $$\displaystyle [\pi/2,\pi]$$.
is there a solution?