Problems involving tension in the string

A transverse wave is traveling on a string. The displacement y of a particle from its equilibrium position is given by
y= (0.021 m) sin (25t - 2.0x).
The phase angle 25t - 2.0x is in radians, t is in seconds and x is in meters.
The linear density of the string is 1.6 x 10^-2 kg/m.

What is the tension in the string?

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