### Possible Answer

press shift + sin (you will get sin inverse) Sin Inverse ( 0.8191 ) = theta - read more

Sin2Theta is part of the "Double Angle Formulas" which is [Sin2(Theta) = 2*sin(theta)*cos(theta)] so you can plug / 2*sin(theta)*cos(theta) / into you calculator and the vaule is the same as sin2(theta). - read more

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