x'+x/y=x^2*y
y = - 3x + 5, 5x + 9y = 1
ptanx+qtany=tanz
998200
983883
174096
179088
7120402
4670534
1457728
(x^(cosx+1))′
f(x)=(3X^2 -4x)^3 . f’(x)=? solve derivative
if 4x-5y=8/3 and 66x=42y find y-x
2325942
5x + 9y = 1
y = - 3x + 5
1172296
