How do you find the exact value of sin(-90)?
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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
Solve sin(90) Microsoft Math Solver
Solve sin(90) Microsoft Math Solver
![](https://useruploads.socratic.org/fJaLgEpeSBClh16XFAbY_B43AE892-2414-41AA-BC35-EAD7E55D0B94.jpeg)
How do you find the exact value of sin(-90)?
![](https://useruploads.socratic.org/yBbE4WwbQ3i7oJBifvov_1F3694B1-FA83-4D59-BC2C-FF42C74100BB.png)
How do you find the exact value of sin(-90)?