sec(π−x)=−sec(x)\sec\left(\pi-x\right)=-\sec\left(x\right)sec(π−x)=−sec(x)
a2b4+2a3b3+a4b2a^2b^4+2a^3b^3+a^4b^2a2b4+2a3b3+a4b2
x3+5x2+6x+12x+4\frac{x^3+5x^2+6x+12}{x+4}x+4x3+5x2+6x+12
−e−tsin (t)+e−tcos (t)=0\:-e^{-t}\sin\:\left(t\right)+e^{-t}\cos\:\left(t\right)=0−e−tsin(t)+e−tcos(t)=0
2340234^02340
9sec2x −5tan2x9\sec^2x\:-5\tan^2x9sec2x−5tan2x
log(11)=log(x−8)−log(15)\log\left(11\right)=\log\left(x-8\right)-\log\left(15\right)log(11)=log(x−8)−log(15)
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