Horizontal Tangent of a Trigonometric Function
Consider the function $$f(x)= a\sin(x)+b\cos(x)$$. If the graph of $$f$$ has a horizontal tangent at $$x=0$$ and $$f(0)=2$$, which of the following is the equation for $$f(x)$$?
A
$$2*\sin(x)$$
B
$$2*\cos(x)+1$$
C
$$2*\cos(x)$$
D
$$3*\cos(x)$$
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