Where do Sin, Cos and Tan Actually Come From - Origins of Trigonometry - Part 1

sin(x) + cos(x) = 1 by Identities (Flawed)

Sine Curve and the Unit Circle

Trig Visualized: One Diagram to Rule them All (six trig functions in one diagram)

Why does cos(t)=x and sin(t)=y?

The most important limit in Calculus // Geometric Proof & Applications

Solve the Trigonometric Equation sin(x)cos(x) = 1/4 by using Identities

A Beautiful Exponential Equation | Only Geniuses Can Solve This

When sin x + cos x = 1/2, find the value of sin x cos x.

Graphing Sine and Cosine Trig Functions With Transformations, Phase Shifts, Period - Domain & Range

Solve the Trig equation sin x + cos x = 1 over the interval [0, 2pi)

sin(x) + cos(x) = 1 by t-results

Proofs: Lim sinx/x =1 and lim [cosx -1] /x =0 as x goes to zero from geometry

sin x + cos x = 1, find value of x

What is sin(x)sin(x) + cos(x)cos(x) = ?

Important Trigonometric Identity (1+sinx+cosx)/(1-sinx+cosx)=(1+sinx)/cosx Test

Solve cos(x) - sin(x) = 1

sin x - cos x = 1, find value of x

Prove (1 - sin x)/cos x = cos x / 1 + sin x

Verify Trig Identity cos x/(1- tan x) + sin x/(1 - cot x) = sin x + cos x. Common denominator