$\sin^2x-cos^2x=2\sin^2x-1$

$\left(\frac{1}{2}x^2+3y^2-a^2\right)^2$

$\frac{\left(sec\:a\:-\:tana\right)}{seca\:+\:tan\:a}$

$\left(6x\right)\left(7y\right)\left(2\right)$

$\int x\cdot\cos\left(3x+2\right)dx$

$\int\frac{4\left(5\sin\left(1\right)\right)^2}{25-\left(5\sin\left(1\right)\right)^2}dx$

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