$\frac{\sin\left(x\right)-\csc\left(x\right)}{\csc\left(x\right)}=-\cos^2\left(x\right)$
$\left(11x\:-\:6\right)\:\left(11x\:+\:6\right)$
$y=\cot\left(-x\right)$
$4\left(a\right)\left(1\right)$
$\frac{1}{\left(cosx+1\right)\left(cosx-1\right)}=\frac{1}{tan^2x.sin^2x}$
$0=x^2+6x-15120$
$-10+23-\left(-120+12\right)$
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