The cotangent is the reciprocal of the tangent, so simply calculate, on your scientific calculator, 1 / tan(68).
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cotangent(50) = 1/tangent(50) = 0.8391
90 - 68 ie 22 degrees
Right angles = 0.154
90-22-68
Cotangent is a trigonometric function. It is the reciprocal of the tangent.