$\sin^2a+1=2-\cos^2a$
$-36\cdot4$
$-1a+9a$
$\left(4+y\right)^{15}\left(4+y\right)$
$\frac{2x^2+6}{x^2+4}$
$5\left(k+2\right)$
$\left(a^4z^5-6\right)^2$
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