$\tan^2\left(-x\right)+1=\sec^2\left(x\right)$
$36x^6+36x^5+9^4$
$\frac{\left(30+4\right)}{\left(5\cdot4-3\right)}+\frac{\left(14-4\right)}{\left(8-6\right)}$
$-\infty6$
$\sin\left(10x\right)\cos\left(7x\right)$
$467\cdot340$
$2\cos\left(2x\right)-1=cos\left(4x\right)+cos\left(2x\right)$
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