$w=x\sin y$
$169x^27^4$
$f\left(x\right)=\:sen\:x\:cos\:x\:-\:x^2$
$f\left(y\right)=\frac{x^3-9x}{x+3}$
$1-cos^2\theta\:=sin\theta\:\:cos\theta\:\:tan\theta\:$
$\int\left(2-x^2\right)^2dx$
$3\:2^2\:-5\:2\:-1$
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