The trigonometric ratios sine, cosine and tangent are used to calculate angles and sides in right angled triangles. We are now going to extend trigonometry beyond right angled triangles and use it ...

Let’s look at how to use trigonometric identities to calculate missing sides. \({sin~θ} = \frac {opposite} {hypotenuse}\) \({cos~θ} = \frac {adjacent} {hypotenuse ...

The tangent line to a graph does not exist at a corner ... The Derivative of Sine 3.3 So you know the derivative of sine is cosine, but do you know why? This applet gives some pretty compelling visual ...