cos 106.8
    (7/2)^2-4*(-141)
    95*6.891386+607.190704
    1000/1.057^9
    1000/1.113^9
    ((1-1/(1+0.057)^9)/0.057)
    ((1-1/(1+0.113)^9)/0.113)
    0.098*1000*(((1-1/(1+0.113)^9)/0.113)+1000/(1+0.113)^9)
    0.098*1000*(((1-(1/(1+0.113))^9)/0.113)+1000/(1+0.113)^9)
    98*(((1-1/(1+0.113)^9)/0.113)+1000/(1+0.113)^9)
    0.098*1000*(((1-1/(1+0.113)^9)/0.113)+1000/(1+0.113)^9
    9.8%*1000*[[(1-1/(1+0.113)^9 ]/0.113]+1000/1.113^9
     0.785*1.42^3.5+0.174*1.42^3
    361➗16
    1÷1/3*3
    1697857-1697857*0.2
     arctan((tan(π/3))*(tan(π/3)))
    arctan((tan(π/4))*(tan(π/4)))
    arctan((tanπ/4)(tanπ/4))
    arctan(tanπ/4)(tanπ/4)

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