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Its a branch of mathematics which involves lengths and angles of triangle.If 1 angle is 90 degree and the other is known then the third is fixed bcoz sum of all angles of Δ is 180 degree.
This are the formula used in trigonometry,
It is used in many fields like in astronomy,satellite navigation,etc.
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In mathematics it is a branch which deals with relation of sides and angles of triangles. like sin, cos, tan, cot, cosec and sec. this is the perfect definition for your level.
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