30 [sin] to calculate the sine function of 30 degrees, with the 115ES its [sin] 30 [=]. The 115ES has all the standard trigonometric functions: Standard functions (sin, cos, tan), type the [sin], [cos
sin(30 deg)+sin(40 deg)=1.14278761 And even if your functions are hyperbolic functions the first expression cannot give 0 otherwise 30 would be equal to 40, and no reasonable person would expect that.
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