$\cos\left(x\right)=0.9$
$-4\left(-2\right)^2\:\left(-1\right)+2\left(-2\right)\left(-1\right)^2\:+3$
$\sin^2x-2\cos x=0$
$25\:+\:-78\:+\:-32\:\cdot\:-12$
$\cot^2x+1=\frac{1}{\sin^2x}$
$13+6+12+-15$
$-63-96$
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