$6f+2f^2+7f^3+6f+2f^3+7f^2+6f$
$35y+28$
$\ \:\left(x^7\right)^3=x^4$
$\left(x^2+5x\right)^2-x\cdot\left(x-5\right)^2$
$\left(16a^4:4a^2\right):2a$
$3-m=1$
$\frac{\cos^2x}{\left(1+\sin x\right)\left(1-\sin x\right)}$
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