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==equ==
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==cal==
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==LiAl==
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==que==
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current location:Mathematical operation > History of Mathematical Computation
3.75cos20
180-90+arctan(-1.355)-arctan2.71
180-90+arctan2.5-arctan5=
(2.74-1)/(1+1.7)
( 1320.8+800+2590.5)/ (3982.38)
2×150×3.14×2.5×1.1
50.03×7.96×1×10
50.03×0.8×2.4×10
(1413+0)/(1149.12+907.92+800)
1.8×4.85×4×2.6×10
2×150×3.14×2.5×0.6
59.85×0.8×2.4×10
( 840.50+800+1648.5)/ (3782.26)
2×150×3.14×2.5×0.7
50.03×7.56×1×10
50.03×0.7×2.4×10
=59.85-π×(2.5/2)^2*2
=59.85-π×(2.5/2)^2
48/[(cos20)^3]
4πcos20
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