That depends whether 312 is in degrees or in radians. Just open your scientific calculator (there is one included on most computers; don't forget to set it to "scientific"), select the correct angular measurement (usually degrees or radians), and do the calculation.
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If you don't have a scientific calculator you can use Google: just enter sin 312 radians or sin 312 degrees.
For more general expressions use the link attached below. For example, you can enter sin(312)+cos(312). This site will assume degrees in this instance but offer you the option of calculating the result for radians.
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The absolute value of the sine function cannot exceed 1 and so sin(a) = 312 is not possible.
sin 480° is equal to sin 60°, which is sqrt(3)/2 or approximately 0.866.
312
312 is the only number that equals 312. There isn't any other one.
312 hours is equal to 13 days.