$2\sin^2\theta$

$013\infty$

$\sin^2\left(30\right)+\tan^2\left(30\right)$

$\lim_{h\to0}\left(\frac{2\left(x+h\right)^5-5\left(x+h\right)^3-2x^5+5x^3}{h}\right)$

$\frac{cot^2\left(x\right)sin\left(x\right)}{2sec\left(x\right)cos^3\left(x\right)}$

$3ab-6a^2b^2c$

$\lim_{x\to\infty}\left(\frac{3x}{\sqrt{x^2}}\right)$