Trigonometric equations often have infinitely many solutions, due to the periodicity of the functions. Take a simple example, sin x = 0. This equation is satisfied by an angle of zero, but also by an angle of pi, 2 x pi, 3 x pi, etc. (this is in radians; the equivalent in degrees would be 0°, 180°, 360°, etc.). Once you find two base solutions (in this case 0 and pi), repeatedly adding the length of the period (in this case, 2 pi, equivalent to 360°) will give you additional solutions.
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there can be more than 1 answer for some trig equations and you must use your knowledge of periodicity to get the answers.
The students and teacher of my trig. class
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Yes, sine is a trig function, it is opposite over hypotenuse.
If you are in school and are studying trig then you are using trig in real life.