acos-1
    acos-1
    acos0
    acos0
    acos0
    acos1
    acos0.5
    acos0.5
    acos90
    acos90
    acos180
    acos180
    sin30*(cos29.635544)/(sin29.635544)-cos29.635544
    2^5
    1/tan29.884200-1/tan30
    2*(cos29.884200-cos30)
    2*2
    4115226337448559670781893×27
    0.26÷0.48×2.4
    1371742112482853223593964334705075445816186556927297668038408779149519890260631×81

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