Solving for x in 10 (1-cos^2 x) = 1 - 3 sinx

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hello, can someone help me with this problem: 10 (1-cos^2 x) = 1 - 3 sin x
how can you simply solve that? thanks a lot!
 

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is there a way you can write cos(x) in terms of sin(x)? hint sin^2(x) + cos^2(x) = 1

then ask your self how would you solve 0 = 10y^2 -3y +1
 
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