Why don't tan [math]90^{\circ}[/math] and tan [math]270^{\circ}[/math] exist? - Quora

Answer (1 of 11): What is a "tangent"? It is a line that intersects a circle at only one poimt. Then what is the "TAN" function? It is a function, that returns the slope of the tangent line for a given angle relative to a zero angle. With the "slope" of the tangent line and the point of intersect

Why is tan 270 undefined? - Quora

Can we prove basic trigonometry with geometry? - Quora

How to solve the following trigonometric equation in the range given, 4 sin 2Q + 3cos2Q = 0 - Quora

What are the zeros of the function tan(x)? - Quora

How to calculate trigonometric functions manually without using a calculator - Quora

Tan 90 Degrees: Value of tan 90 with Proof, Examples and FAQ - mydomain

The point (-4, 3) is on the terminal arm of angle theta in standard position. What are the primary trigonometric ratios of this angle? - Quora

Why is tan90=1/0 written as infinity? - Quora

How to understand trigonometry - Quora

What is the angle that has all three trigonometric functions (sine, cosine, and tangent) equal to zero? - Quora