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yes they do
None. You do not need any knowedge of astronomy to study and be an expert at trigonometry.
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Yes.
One example of an astronomer's use of trigonometry is determining the distance to a star by triangulation.
They use complicated trigonometry and mathematics.
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how can trigonometry use in metallurgy
astronomers use telescopes
Well, if Edward Cullen the bloodsucking vampire can use trigonometry. Then I am asuming farmers can as well.
Mechanics use trigonometry to find angles mostly used in body or chassis work.
The first recorded use of trigonometry came from the Hellenistic mathematician Hipparchus
Yes.
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yes they do
An architect who designs a bridge would use trigonometry, among other mathematical techniques.