Math.cos(Math.radians(90)) doesn't give 0
68968
Math.cos inaccurancy
112179
Why don't the results of testing $H_0 : \beta = 0$ and $H_0 : {\rm cor}(X,Y)=0$ agree?
117393
Behavior of ArcTan when two zeros are given as arguments
106828
If $0 \lt x \lt \frac{\pi}{2}$, is $\cos(x) \le \frac{\sin(x)}{x} \le \frac{1}{\cos(x)}$?
19083
Do you use degrees or radians for trig functions?
112801
Why is this simple Excel calculation not netting Zero?
92055
In JavaScript, why is "0" equal to false, but when tested by 'if' it is not false by itself?
114227
Mathematica won't simplify multiplication by zero
54512
How do I prove: $\cos (\theta + 90^\circ) \equiv - \sin \theta $
50042
What is the method for converting radians to degrees?
46378
Trig substitution; why can we ignore the absolute value?
143584
Trigonometric ratios for angles greater than $90^\circ$?
106867
Limit of $\cos(x)/x$ as $x$ approaches $0$
104321
Prove that $1 + \cos\alpha + \cos\beta + \cos\gamma = 0$
60774
Find the value of : $\cos x \cos 2x...\cos 999x$ given that $x=\frac {2\pi}{1999}$
10889
Mod[1.2, 0.2] is not equal to zero
39862
Why does the derivative of sine only work for radians?