$35+105+87$

$4-\left(2.7+8.95\right)$

$\frac{d}{dx}\left(\ln\left(\frac{2x-3}{x^2-3x+1}\right)\right)$

$\cos\left(b\right)^4-\sin\left(b\right)^4+1=2\cos\left(b\right)^2$

$0=\frac{1}{12}\cdot\cos\left(8x\right)-3\sin\left(8x\right)$

$\frac{d}{dx}x^2-4x+3$

$2cot2x=4$