$15d-24d+9$
$tan2\:\left(b\right)-sec2\:\left(b\right)$
$\sqrt{1-11x}=-32$
$m=\left(x+2\right)\left(x-2\right)\left(x^{2}+2x+4\right)\left(x^{2}-2x+4\right)+64$
$-4a\left(2a-5b+4c\right)$
$100-35.758$
$1-\frac{\sin^2a}{1-\cos a}=\cos a$
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