$\frac{3x+1}{4x-2}$

$\cos\left(x+\frac{\pi}{4}\right)=-\sin\left(x-\frac{\pi}{4}\right)$

$\frac{d}{dx}\cos\:^3\left(5x+1\right)$

$xy'-2y=x^3e^x$

$274-\left(-8+10-45-74\right)$

$-9+\left(-3+4\right)+\left(4-b\right)+\left(b-3\right)$

$\left(cosec\:a\:+\:cotg\:a\:-\:1\right)\:\left(cosec\:a\:-\:cotg\:a+1\right)\:=\:2\:cotg\:a$