$\frac{d}{dx}4x+7y=4$
$315\cdot360$
$\lim_{x\to0}\:\frac{cos\left(x\right)}{x}\:\:\:$
$3v-36=-42$
$\sin\left(2x\right)-\sin\left(x\right)-\sin^2\left(x\right)=0$
$\lim_{x\to0}\left(\frac{e^{2x}}{x^2+1}\right)$
$5x^2-3x+3=0$
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