$x-7=2x+1$

$-2^2-4^{-2}+11$

$\csc\left(2u\right)=0.5\csc\left(u\right)\sec\left(u\right)$

$75x^2+35x-10=0$

$\left(3+2\right)-\left(-12\right)$

$\left(\csc\left(a\right)+\cot\left(a\right)\right)\left(1-\cos\left(a\right)\right)$

$1=\csc^2\left(x\right)-\frac{\csc^2\left(x\right)}{\sec^2\left(x\right)}$