limx→0cos2−1sec2x\lim_{x\to0}\frac{\cos^2-1}{\sec^2x}x→0limsec2xcos2−1
5x2=6x+x35x^2=6x+x^35x2=6x+x3
2ya+b,3y7+6,4y92y^{a+b},\sqrt{3y}^{7+6},4y^92ya+b,3y7+6,4y9
secy+tany\sec y+\tan ysecy+tany
∫eu⋅u\int e^u\cdot u∫eu⋅u
12−13u=212-\frac{1}{3}u=212−31u=2
−12ln(x)+ln(x2+4)-\frac{1}{2}\ln\left(x\right)+\ln\left(x^2+4\right)−21ln(x)+ln(x2+4)
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