If there are two tangent lines perpendicular to each other on the image of function f (x) = ax + SiNx (a is a real number), then the value of a is

a=0
Because there are two tangent lines perpendicular to each other, it means that there are two values in the range of derivative, and the multiplication equals - 1
In the range of [A-1, a + 1], only a = 0 can the product of positive one and negative one be equal to - 1

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