December 2018 2 68 Report
Gdzie jest błąd?
 \left \{ {{sinx+cosx=0} \atop {sin^2x+cos^2x=1}} \right. \\ \left \{ {{sinx=-cosx} \atop {(-cosx)^2+cos^2x=1}} \right. \\2cos^2x=1\\cos^2x= \frac{1}{2} \\cosx= \frac{ \sqrt{2}}{2} \ lub \ cosx=- \frac{ \sqrt{2} }{2} \\x= \frac{\pi}{4} +k \pi\ lub\ x= \frac{3\pi}{4} + k\pi,\ gdzie\ k\in C
a powinno być:
x= \frac{3\pi}{4} + k\pi,\ gdzie\ k\in C

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