What are sin and cos and why are they used so frequently in math?
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Sine and cosign are fundamental concepts in trigonometry – the study of triangles. As it turns out, trigonometry comes up **a lot** in math – so much so there is an entire branch of math dedicated to studying them. They are both expression of the relationship between angles and sides in a right triangle:
– Sine is the ratio of the length of the side that is opposite that angle to the length of the longest side of the triangle (the hypotenuse),
– Cosine is the ratio of the length of the adjacent leg to that of the hypotenuse.
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