Trigonometry is not some sort of stand-alone academic subject but an integral (!) part of Mathematics as a whole - a concept apparently missed by many 'Answers' questioners. Rather than single examples, Trig is just one of many mathematical techniques used in:
Surveying. Navigation. Cartography. Geology. Mining & deep-well drilling. Civil and Mechanical Engineering design. Electrical & Electronic Circuit analysis and design. Harmonic Analysis (used in sound, vibration, oceanographic and electronic research to name 4 fields). Sonar and Radar signal generation, collection & analysis...... Astronomy: e.g. the Parsec used for measuring deep-space distances is a trig-based unit. ...
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some application of trignomentry
taxes, sales, investment etc
Trampolines, garage doors, taints, and anal wrinkles
you use math in everyday of your life !
Optics deals with light waves, and all waves relate in some way to trigonometry. Also, the reflection and refraction of light involves trigonometry.