$\lim_{x\to0}\left(1-sin\left(3x\right)\right)^{\frac{1}{x}}$
$\int\frac{t^4+4t^3+t^2+1}{t^2+1}dx$
$24\cdot2-8\cdot$
$21x^8y^5\:63x^5^2\:45x^4\:y^3$
$54+0.003$
$\frac{1-cos2x}{cos^2x}=\frac{2}{cot^2x}$
$13x=416$
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