$\left(cos\left(\frac{\pi}{2}-b\right)cosb\right)-\left(sin\left(\frac{\pi}{2}-b\right)sinb\right)$
$\tan^240$
$\frac{x}{x-y}+\frac{x}{x+y}$
$2^3\cdot2$
$\int_{\frac{\pi}{2}}^{\frac{3\pi}{4}}\cot\left(x\right)dx$
$\:y+3y^2+8y+y^2$
$\int_0^2\left(x+4\right)\left(5x^3-2\right)dx$
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