Tusanga Calculator
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plot( fun, x^3 - 4*x^2 + 2*x - 5, x == [-4..5] ) ; a = 2^5 - 2*4 + 21/7 - 4! ; b = a * {2 , 5, 7, 11} ; solve( 2*z^2 == 18, z )
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