Trigonometry is used to define triangles, but it is also useful in the representation of waves. Sound engineers, obviously, use deal with sound waves. The pitch, volume, and direction of a sound wave are all deeply rooted in trigonometry.
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they us it in computer graphics
Engineers and Physicists use trigonometry, as well as people whose carrers involve acoustics, optics, and waves.
how can trigonometry use in metallurgy
Yes, because all sound waves can be modelled as sine (or cosine) waves, or combinations of sine waves.
That depends on your profession. If you are a math teacher, then you might use a lot of Trig. If you are an engineer, working with forces on any object from different directions, then you would use trig. Electrical engineers use trig. Surveyors use trig.