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Trigonometry is used for various measurements of right angle triangle. so if you know height and base and incident angle then you can calculate other factors of triangle. Trigonometry is very useful in algebra too! in exam you can get mathematical problems which are included sin, cos, tan, cot, sec, cosec. Firstly it may appear boring. but once you understood then it will much interesting like puzzle. It is very useful to engineering. i hope this answer is useful.
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