$sinx\left(secx+cotx\right)=cosx$
$2y'+2y=e^{-x}$
$=\left(6\right)^{2}-\left(-3\right)^{2}-4$
$x2+6x+5+x+1$
$2b+5a+14+2+b-12a$
$\left(3x+5y-z-2w\right)^2$
$cos\left(2a\right)=\frac{1-tan^2a}{1+tan^2a}$
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