M : \quad A = - \int _ { - \pi } ^ { 0 } \sin x d x + \int _ { 0 } ^ { \pi } \sin x d x
Solve for M
M=4A
A\neq 0
Solve for A
A=\frac{M}{4}
M\neq 0
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\frac{1}{A}M=0
The equation is in standard form.
M=0
Divide 0 by A^{-1}.
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