$\lim_{x\to-15}\left(\frac{\sin\left(\sqrt{x+15}\right)}{x+15}\right)$
$\left(x+y\right)^4$
$-6k+6-k_{-8}$
$7x^{2}+8x^{3}y^{4}-5x^{3}y^{4}-6x^{2}y$
$\frac{\left(x^7+x^4+x^2+x+1\right)}{x^3+2x+1}$
$1-cos\left(\frac{x}{2}\right)=0$
$\sin\left(a\right)=30$
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