how do you find the area of trapezoid?
geometry 几何>ε07з30点/线/面| point /line/ plane
a diagonal line slashed from left to right through the center of
the right formula scales double for y axis of the point (0,1,0).
tangent or tanh function●公式:tanh(z)= 2 /(1 e-2x)● formula
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