cos(90)
    cos0.5
    999899990001*891
    (1+sin(32))/(1-sin(32))
    -90 - arctan(0.1*2) - arctan(0.2*2)
    90 - arctan(0.1*4) - arctan(0.2*4)
    90 - arctan(0.1*2) - arctan(0.2*2)
    -10lg(1-0.004)=
    （1.049*10^-5*0.085*17^0.5+1.87*10^-5*0.915*29^0.5）:(0.085*17^0.5+0.915*29^0.5)
    443.54*1.6
    918.38*sin15
    918.38*cos30cos15
    918.38*sin30cos15
    sin30cos15
    arctan1.43
    arctan1.43
    0.84∧0.6666
    0.84∧2➗3
    arcsin0
    arcsin（-1/2）

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