$49-64x^2$

$\frac{\tan\:\left(x\right)\sin\:\left(x\right)}{\tan\:\left(x\right)+\sin\:\left(x\right)}=\frac{\tan\:\left(x\right)-\sin\:\left(x\right)}{\tan\:\left(x\right)\sin\:\left(x\right)}$

$\frac{\frac{1}{\cos\:\left(x\right)}}{\frac{1}{\cos\:\:\left(x\right)\sin\:\:\left(x\right)}}$

$\int\frac{\left(3x+2\right)\left(x-4\right)}{x-3}dx$

$a+b\cdot c;\:a=5;\:b=25;\:c=10;$

$1x^2-4$

$\sqrt{6^2+8^2}+\sqrt{5^2-3^2}$