$sin\left(x+y\right)+sin\left(x-y\right)=2sin\left(x\right)\cdot cos\left(y\right)$
$\frac{2-sin^2\left(x\right)}{cos\left(x\right)}$
$\int\left(-\sqrt{14}x\right)dx$
$y'\:=\:4y\:+\:x^2\:+\:9$
$\int\left(x\ln\left(5-x\right)\right)dx$
$-48\:\cdot\:43$
$cos\:y^2-sin\:y\:^2=1-2sin\:y^2$
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