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Barrs
@Barrs
August 2022
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Найдите значение выражения 25 sin4a, если sin2a=0.6 a принадлежит от (пи/4 до пи/2)
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NastyaNikonorova
25sin4a=50sin2acos2a,
cos2a=
=0.8
50sin2acos2a=24
2 votes
Thanks 3
dasdasfa
25sin4a=25*2sin2a cos2a;
sin^2 (2a)+cos^2 (2a)=1;
cos2a=-√(1-sin^ (2a)); a (pi/4;pi/2); 2a (pi/2;pi)
cos2a=-√(1-0,36=-√0,64=-0,8
25sin4a=50*0,6*(-0,8)=-24
3 votes
Thanks 7
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Answers & Comments
cos2a==0.8
50sin2acos2a=24
sin^2 (2a)+cos^2 (2a)=1;
cos2a=-√(1-sin^ (2a)); a (pi/4;pi/2); 2a (pi/2;pi)
cos2a=-√(1-0,36=-√0,64=-0,8
25sin4a=50*0,6*(-0,8)=-24