General solution of the differential equation $y''-\sin(x)y=0$ given $y(\pi)=1$ and $y'(\pi)=0$

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Does there exist a method to solve this in a "simpler" way than im trying to? im trying to use the powerseries of sin(x) and show that they are the same. but i end up with a lot of algebra that gets me noway.

also its up to 5 digits in the answer