worldchampion
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- Xu
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1.giai phuong trinh : voi x \epsilon [0 ; \frac{\Pi }{2} ]
\frac{1}{((tanx)^{2}+1+tan x)^{2}} + \frac{1}{((cotx)^{2}+1+cotx^){2}} +\frac{(sinx + cosx)^{4}}{4}=\frac{5(sin2x)^{3}}{4}
2.tim ho nguyen ham cua
I= \int \frac{1}{(sinx)^{3}+(cosx)^{3}}dx
\frac{1}{((tanx)^{2}+1+tan x)^{2}} + \frac{1}{((cotx)^{2}+1+cotx^){2}} +\frac{(sinx + cosx)^{4}}{4}=\frac{5(sin2x)^{3}}{4}
2.tim ho nguyen ham cua
I= \int \frac{1}{(sinx)^{3}+(cosx)^{3}}dx
