Hyberbolic and Circular (Trig) Functions: Why no parabolic?
90316
Do "Parabolic Trigonometric Functions" exist?
19083
Do you use degrees or radians for trig functions?
79822
Problems with partial derivatives.
87487
Applications of derivatives outside mathematics and physics
34070
Agreed upon domain of inverse trig functions
140851
Precalculus unit circle with imaginary axis.
92307
Relation between shm and circular motion
136692
Why should the spatial derivative order of the ODE *not* exceed two?
74409
Differentiaion Calculus: Trig Inverse Function.
1331
Approximation of the Sine function near $0$
12299
Are there other kinds of bump functions than $e^\frac1{x^2-1}$?
101281
Does there exist a smooth function which is nowhere analytic?
43637
Derivative of the sine function when the argument is measured in degrees
42374
Shape of a rotating fluid surface
68171
Non-trigonometric Continuous Periodic Functions
96303
When does $h(x^2+y^2)$ be harmonic?
16886
Pointwise Cauchy-Riemann equations suffice?