exam Maths Puzzle Numerical Ability

Solve for x:
sinx=cos2x

show work please!
i need by tonight!
thanks so much if you answer!

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exam Other Question

3x^2 + 2x^2 - 7

I think the answer is -2x^2

I am trying to Siplifying expressions
find all real values of x such that f(x)=0:
f(x)=15-3x
please help
thanks