Trignometry is used to calculate angles in length in carpentry.
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Virtually non-existent. I cannot think of any modern trigonometric instrument that is wooden.
Simple addition, subtraction, multiplication, division, geometry, and trigonometry.
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The uses of Sin, Cos etc. in Maths is in relation to Trigonometry. Trigonometry is the study of the relationship between angles and lengths of triangles.
libraries have trig books.
Trigonometry is the study of plane and spherical triangles. Plane trigonometry deals with 2 Dimensional triangles like the ones you would draw on a piece of paper. But, spherical trigonometry deals with circles and 3 Dimensional triangles. Plane trigonometry uses different numbers and equations than spherical trigonometry. There's plane trigonometry, where you work with triangles on a flat surface, then there's spherical trigonometry, where you work with triangles on a sphere.