（13.7-12.3）/12.3
    （12.89-12.3）/12.3
    432-278
    89+52
    (1+7.8%/12）^12-1
    (1+7.8%/2）^2-1
    0.0444/3=
    1-cos45
    cos(120/630*180)
    (1/30)
    √(1/30)
    √-4
    √-2
    √-3
    √2.5
    √1.5
    √2
    180-90-arctan(3.77/20)-arctan(3.77/10)-arctan(3.77/4)
    6.93*(6.93/20+1)*(6.93/4+1)*(6.93/10+1)
    180-arctan(3.77/4)-arctan(3.77/20)-arctan(3.77/10)

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