Answer to Question #226460 in Calculus for Skhu

Question

Terminal points P(x,y)

Answer 1

Let $P(x, y)$ be the terminal point on the unit circle determined by $t.$ Then

$$\sin t=y, \cos t=x, \tan t=\dfrac{y}{x}$$

$$x^2+y^2=\cos^2 t+\sin^2t=1$$