The absolute value of the sine function cannot exceed 1 and so sin(a) = 312 is not possible.
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The "sin" button on a calculator gives the sine trigonometric ratio of the given angle.
First find 180 minus the vertex angle and divide that by 2 to get the other angles. Then solve the other sides by using sin(vertex angle)/base=sin(other angles)/other sides.
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.-----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.
type the value of sine in the calculator and press 2ND SIN for sin-1, or press 2ND SIN for sin-1 and type the value of sine, because -sin(.xxxx) = angle known as inverse sine
The arcsine is the angle whose sine is equal to the given value. arcsine is also called sine inverse (sin-1 ) if sin 30o = 1/2 , then sin-1 1/2 = 30o