algebra precalculus - Using unit circle to explain $\cos(0) = 1$ and $\sin( 90) = 1$ - Mathematics Stack Exchange
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Description
We have been taught $\cos(0) = 1$ and $\sin(90) = 1$.
But, how do I visualize these angles on the unit circle?
![algebra precalculus - Using unit circle to explain $\cos(0) = 1$ and $\sin( 90) = 1$ - Mathematics Stack Exchange](https://i.ytimg.com/vi/QvSI2yS5M1w/maxresdefault.jpg)
Solve Trigonometric Equations, Analytic Trig
![algebra precalculus - Using unit circle to explain $\cos(0) = 1$ and $\sin( 90) = 1$ - Mathematics Stack Exchange](https://i.stack.imgur.com/E3BoY.png)
algebra precalculus - Simple Trigonometric Equation - Mathematics
![algebra precalculus - Using unit circle to explain $\cos(0) = 1$ and $\sin( 90) = 1$ - Mathematics Stack Exchange](https://i.ytimg.com/vi/p8jYoRvd1-Y/maxresdefault.jpg)
Another way to remember why Sin(90°) = 1 without memorizing the
![algebra precalculus - Using unit circle to explain $\cos(0) = 1$ and $\sin( 90) = 1$ - Mathematics Stack Exchange](https://i.stack.imgur.com/9nhZ7.gif)
![algebra precalculus - Using unit circle to explain $\cos(0) = 1$ and $\sin( 90) = 1$ - Mathematics Stack Exchange](https://www.coolmath.com/sites/default/files/images/28-trigonometry-18.gif)
Precalculus Review Calculus Preview - Cool math . com - The Unit
![algebra precalculus - Using unit circle to explain $\cos(0) = 1$ and $\sin( 90) = 1$ - Mathematics Stack Exchange](https://i.ytimg.com/vi/cIYxGL1OXxk/maxresdefault.jpg)
Lesson 7 - Finding Sin, Cos, Tan Using The Unit Circle (Trig
![algebra precalculus - Using unit circle to explain $\cos(0) = 1$ and $\sin( 90) = 1$ - Mathematics Stack Exchange](https://study.com/cimages/videopreview/videopreview-full/precalculus-high-school-practice-problems-with-circular-trigonometric-functions_129743.jpg)
Unit Circles, Overview, Radians & Tangent - Lesson
![algebra precalculus - Using unit circle to explain $\cos(0) = 1$ and $\sin( 90) = 1$ - Mathematics Stack Exchange](https://i.stack.imgur.com/NHvmY.gif)
Trigonometry unit circles - Mathematics Stack Exchange
![algebra precalculus - Using unit circle to explain $\cos(0) = 1$ and $\sin( 90) = 1$ - Mathematics Stack Exchange](https://i.ytimg.com/vi/J7V_IegajF0/maxresdefault.jpg)
Trigonometric Functions of Any Angle - Unit Circle Method
![algebra precalculus - Using unit circle to explain $\cos(0) = 1$ and $\sin( 90) = 1$ - Mathematics Stack Exchange](https://homework.study.com/cimages/multimages/16/unitcircle8717013334248191494.png)
Evaluate the expression without using a calculator. arccos 1/2
![algebra precalculus - Using unit circle to explain $\cos(0) = 1$ and $\sin( 90) = 1$ - Mathematics Stack Exchange](https://qph.cf2.quoracdn.net/main-qimg-9db4e38e3c6912a55359f7655ac9be74.webp)
![algebra precalculus - Using unit circle to explain $\cos(0) = 1$ and $\sin( 90) = 1$ - Mathematics Stack Exchange](https://i.stack.imgur.com/TkAR7.jpg)
c# - I understand that Sin and Cos are in radians, but why I am
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