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If the 49.5 is in radians, then sin 49.5 ≈ −0.693 and so yes.
If the 49.5 is in degrees, then sin 49.5o ≈ 0.760
If the 49.5 is in gradians, then sin 49.5 ≈ 0.702
If the 49.5 is in some other angle measurement, then you'll have to decide as I only know Degrees, Radians and Gradians angle measures.
In Degrees, one full turn is 360o
In Radians, one full turn is 2π radians ≈ 6.283 radians
In Gradians, one full turn is 400 gradians.
Radians are most useful in calculus.
In fact you've used radians without realising it:
The length of an arc of angle θ of a circle of radius r is θr when θ is measured in radians; the length of an arc of a circle round one full turn (ie the circumference of a circle) is θr = 2πr since one full turn is 2π in radians.
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Rule for multiplying integers?
Positive x negative = negative (Negative x positive = negative) Positive x positive = positive Negative x negative = positive So if the signs are the same the answer is positive and if they are different it is negative.
Is Sin a negative function or positive?
negative
Can reference angles be negative?
Certainly. A negative angle is simply clockwise instead of counterclockwise from the zero angle, but this is usually not indicated as such on a drawing.
Why is the tangent positive on quadrant III?
The tangent function is equal to the sine divided by the cosine. In quadrant III, both sin and cos are negative - and a negative divided by another negative is positive. Thus it follows that the tangent is positive in QIII.
A organized list of possible combinations?
Should be used where possible.
