Why, in Trig is Tan, the slope of the triangle called the "Tangent" when it is perpendicular to the actual tangent?
49720
Why is the tangent of an angle called that?
129319
Weird "hidden answer" in $2\tan(2x)=3\text{cot}(x)$
30600
Why does $\tan^{-1}(1)+\tan^{-1}(2)+\tan^{-1}(3)=\pi$?
2676
Finding $\frac {d(\tan \theta)}{d\theta}$
10289
Need help in proving that $\frac{\sin\theta - \cos\theta + 1}{\sin\theta + \cos\theta - 1} = \frac 1{\sec\theta - \tan\theta}$
59431
slope of a line tangent through a point
12640
Is there a geometrical definition of a tangent line?
55436
Why does $A\sin{k(x+c)}=a\sin{kx}+b\cos{kx}$ imply that $A=\sqrt{a^2+b^2}$ and $\tan{c}=-b/a$?
61343
Prove that if $\alpha, \beta, \gamma$ are angles in triangle, then $(tan(\frac{\alpha}{2}))^2+(tan(\frac{\beta}{2}))^2+(tan(\frac{\gamma}{2}))^2\geq1$
25569
Intuitive understanding of the derivatives of $\sin x$ and $\cos x$
144641
Tangents are drawn from the point $(\alpha,\beta)$ to the hyperbola $3x^2-2y^2=6$ and are inclined at angles $\theta$ and $\phi$ to the $x-$axis.
72157
Elementary proof of tangent half angle formula
97056
Why is a geometric progression called so?
74409
Differentiaion Calculus: Trig Inverse Function.
86583
Taylor Series of $\tan x$
94283
Different ways finding the derivative of $\sin$ and $\cos$.
120444
Trigonometric Triangle Equality