$2ac2+2fb1$

$2\sin\:^2a-1=\sin\:^4a-\cos\:^4a$

$\left(x+2a\right)\left(x-4a\right)$

$\frac{\sin\left(270+x\right)+\cos\left(90+x\right)}{\csc\left(360+x\right)+\sin\left(180-x\right)}$

$912x^2-3174x-713=0$

$\frac{dp}{db}=2p\left(1-\frac{p}{100}\right)$

$-\left(\frac{-11}{11}\right)$