what is cos. sin. tetha
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with text by Lewis Lehe. Sine and cosine— a.k.a., sin(θ) andcos(θ) — are functions revealing the shape of a right triangle. Looking out from a vertex with angle θ, sin(θ) is the ratio of the opposite side to the hypotenuse , while cos(θ) is the ratio of the adjacent side to the hypotenuse .
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if you are in standard 9th then you have the last chapter in that you are having many formulas so you can follow that then you will get the formulas of whatever you want about cos sin and theta
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