$\frac{\cos\:\left(2x\right)}{\sin\left(2x\right)+1}=\frac{\cos\left(x\right)-\sin\left(x\right)}{\cos\left(x\right)+\sin\left(x\right)}$

$+-0,4=0,6$

$\left(8x^3-15x^2+9\right)-\left(x^3-20x^2+3x+5\right)$

$0.0345+0.458+0.0591+0.1$

$dy=\left(3x+2\right)dx$

$34\left(-43\right)$

$-1.3-\left(-1.9\right)$