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Valllllya
@Valllllya
October 2021
1
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найдите пожалуйста значение выражения:
корень из 50-(корень из 200*sin^27П/8)
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uekmyfhfp
Так sgrt200= sgrt(50*4)= sgrt50* sgrt4= sgrt50*2;⇒
= sgrt50( 1- 2 sin^2(27pi/8))=sgrt50* cos ( 2* 27pi/8)= sgrt50* cos27pi/4=
= sgrt50* cos(6pi + 3pi/4)= sgrt50*cos 3pi/4 = sgrt50 * ( -sgrt2/2)= - sgrt100/2=
= -10/2 = - 5
4 votes
Thanks 4
Valllllya
а почему корень сos 3П/4 со знаком -?
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Answers & Comments
= sgrt50( 1- 2 sin^2(27pi/8))=sgrt50* cos ( 2* 27pi/8)= sgrt50* cos27pi/4=
= sgrt50* cos(6pi + 3pi/4)= sgrt50*cos 3pi/4 = sgrt50 * ( -sgrt2/2)= - sgrt100/2=
= -10/2 = - 5