[tex]\displaystyle\bf\\\int\limits^\frac{\pi }{2} _\pi {Cosx} \, dx =Sinx\Big|^{\frac{\pi }{2} } _{\pi } =Sin\frac{\pi }{2} -Sin\pi =1-0=1\\\\\\Otvet \ : \ B[/tex]
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[tex]\displaystyle\bf\\\int\limits^\frac{\pi }{2} _\pi {Cosx} \, dx =Sinx\Big|^{\frac{\pi }{2} } _{\pi } =Sin\frac{\pi }{2} -Sin\pi =1-0=1\\\\\\Otvet \ : \ B[/tex]