Find the Reference Angle -pi/40

Math
Find an angle that is positive, less than , and coterminal with .
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Add to .
The resulting angle of is positive and coterminal with .
Since the angle is in the fourth quadrant, subtract from .
Simplify the result.
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To write as a fraction with a common denominator, multiply by .
Combine fractions.
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Combine and .
Combine the numerators over the common denominator.
Simplify the numerator.
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Multiply by .
Subtract from .
Find the Reference Angle -pi/40

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