[tex]\displaystyle\bf\\f(x)=\frac{1}{Sin^{2} x} \\\\\\F(x)=-Ctgx+C\\\\\\\Big(\frac{\pi }{4} \ , \ 5\Big) \ \ \ \Rightarrow \ \ \ x=\frac{\pi }{4} \ \ ; \ \ \ \Rightarrow \ \ \ F(x)=5\\\\\\5=-Ctg\frac{\pi }{4} +C\\\\\\5=-1+C\\\\\\C=6\\\\\\Otvet \ : \ F(x)=-Ctgx+6[/tex]
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[tex]\displaystyle\bf\\f(x)=\frac{1}{Sin^{2} x} \\\\\\F(x)=-Ctgx+C\\\\\\\Big(\frac{\pi }{4} \ , \ 5\Big) \ \ \ \Rightarrow \ \ \ x=\frac{\pi }{4} \ \ ; \ \ \ \Rightarrow \ \ \ F(x)=5\\\\\\5=-Ctg\frac{\pi }{4} +C\\\\\\5=-1+C\\\\\\C=6\\\\\\Otvet \ : \ F(x)=-Ctgx+6[/tex]