sin(180) = 0, cos(180) = -1. You can get those results on any scientific calculator, including the one that comes with Windows. Just make sure that the angle measurement is set to degrees.
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The sine of 180 degrees is 0. Remember, the sine value on a unit circle is the y-value. If you find f(pi) in the function f(x)=sin(x), you will get zero as an answer.
The derivative of negative cosine is positive sine.
Cosine squared theta = 1 + Sine squared theta
It means that the angle in question is any multiple of 180 degrees.
its short for sine. theres sine, cosine, and tangent. sine is opposite over adjacent for the sides of a triangle (or angles)