Why does the trigonometric function change at 90 and 270 degrees
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Primary trigonometric ratios for 90 180 270 and 360 degrees
![](http://www.biology.arizona.edu/biomath/tutorials/trigonometric/graphics/trig_std_pos2.gif)
BioMath: Trigonometric Functions
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Lesson Video: Evaluating Trigonometric Functions with Special Angles
![](https://i.ytimg.com/vi/OdmA_ctmcfE/maxresdefault.jpg)
Primary trigonometric ratios for 90 180 270 and 360 degrees
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![](https://media.geeksforgeeks.org/wp-content/uploads/20220509181113/Trigquad-660x460.png)
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![](https://preview.redd.it/why-does-the-trigonometric-function-change-at-90-and-270-v0-ktifavhb7qua1.png?width=1080&format=png&auto=webp&s=3119ec774f2accbe424f74574c58857e8940a723)
Why does the trigonometric function change at 90 and 270 degrees? Like sin to cos, tan to cot : r/JEENEETards
![](https://thirdspacelearning.com/wp-content/uploads/2023/05/Sin-Cos-Tan-Graphs-Image-3.png)
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