y'=((1-sinx)'*(1+sinx)-(1+sinx)'*(1-sinx))/(1+sinx)²=
(-cosx-cosx*sinx-cosx+cosx*sinx)/(1+sinx)²=-2cosx/(1+sinx)²
6) y'=(-3sinx*x³-3x²*3cosx)/x⁶=-3x²(x*sinx+3cosx)/x⁶=-3(x*sinx+3cosx)/x⁴
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y'=((1-sinx)'*(1+sinx)-(1+sinx)'*(1-sinx))/(1+sinx)²=
(-cosx-cosx*sinx-cosx+cosx*sinx)/(1+sinx)²=-2cosx/(1+sinx)²
6) y'=(-3sinx*x³-3x²*3cosx)/x⁶=-3x²(x*sinx+3cosx)/x⁶=-3(x*sinx+3cosx)/x⁴