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sin (-90) = -1 sin -90 = sin (360 - 90) = sin 270 Angle 270^@ is third quadrant, where only tan and cot are positive. Hence sin 270 = sin (180 + 90) = - sin 90 = -1
How do you find the exact value of sin(-90)?
Solve sin(90) Microsoft Math Solver
Solve sin(90) Microsoft Math Solver
How do you find the exact value of sin(-90)?