Let \( a \) and \( b \) be constants, \( f(x)=a \sin x+b x \cos x+2... VIDEO
Let \( a \) and \( b \) be constants, \( f(x)=a \sin x+b x \cos x+2 x^{2} \). If \( f(2)=15 \), then \( f(-2) \) is :
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