Why do sin(45) and cos(45) give different results?
43
Is floating point math broken?
27132
Can't figure out how $\sin\left(\tan^{-1}(x)\right)=\frac{x}{\sqrt {x^2+1}}$
88432
A problem on range of a trigonometric function: what is the range of $\frac{\sqrt{3}\sin x}{2+\cos x}$?
63737
Incorrect plot using pgfplots (trigonometric functions like cos, sin and tan)
33100
Trigonomnetric equality involving tg
121263
Using $\sin()$ or $\cos()$ for computing SHM?
56934
How do we prove $\cos(\pi/5) - \cos(2\pi/5) = 0.5$ ?.
39862
Why does the derivative of sine only work for radians?
94283
Different ways finding the derivative of $\sin$ and $\cos$.
51829
How have the "following trig formulas" been modified to obtain the new trig formulas?
127247
Why are cosine and sine functions used when representing a signal or a wave?
90226
Proving trigonometric equation $\cos(36^\circ) - \cos(72^\circ) = 1/2$
110261
Value of $ \cos 52^{\circ} + \cos 68^{\circ} + \cos 172^{\circ} $?
81502
Getting different output from seemingly identical calculations
152019
Derivation of inverse sine, what is wrong with this reasoning?
108918
Can someone explain this trigonometric limit?
112179
Why don't the results of testing $H_0 : \beta = 0$ and $H_0 : {\rm cor}(X,Y)=0$ agree?