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The range, R, in metres of a toy slingshot can e modelled by the function R=(81/9.8) sin2x, where x is the angle that the stone

The range, R, in metres of a toy slingshot can e modelled by the function R=(81/9.8) sin2x, where x is the angle that the stone is shot in radians, relative to the ground. Find the maximum range of the slingshot and the angle that produces it.

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