Question

Please help image attached!

Answer 1

Answer:

The unit circle centered at the origin in the Euclidean plane is defined by the equation:

$x^2+y^2=1$

Given an angle , there is a unique point P on the unit circle at an angle θ from the x-axis, and the x- and y-coordinates of P are:

$x=cos \theta \\y = sin \theta$

Consequently, from the equation for the unit circle:

$cos^2\theta+sin^2\theta=1$  

the Pythagorean identity.