$7cos^2\left(3x\right)-cos\left(3x\right)=0$
$\left(7^4\right)^7$
$10+8b=6b-8$
$cos\left(70-x\right)$
$\int_0^{\frac{\pi}{2}}\cos\left(x\right)\:\left(x^2\right)dx$
$3\left(x-5\right)-x$
$10\left(8-2x\right)$
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