1/sin9.5/sin9.5/sin9.5/sin9.5
    1/sin8/sin8/sin8/sin8
    1/sin6.5/sin6.5/sin6.5/sin6.5
    1/sin5/sin5/sin5/sin5
    1/sin(5)^4
    18732158062+15103319194
    75*1.39*10^3
    16sin(2π/3+3π/2)
    10lg(5)=
    10lg(5)=
    10lg(5)=
    （-0.25）^3-0.25+1
    10lg(300)=
    -10lg(300)=
    20lg100
    10lg(0.001)=
    90-arctan(3.41/2)-arctan(3.41/5)-arctan(3.41/10)+arctan(3.41)+arctan(2.93*3.41)-arctan(34.1*3.41)
    0.086*34.1
    10/3.41/0.086
    -10lg(1-0.35)=

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