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000096
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July 2022
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Найдите sin2a и cos [tex] \frac{a}{2} [/tex],если sin a = 0.8,[tex] \frac{p}{2} \ \textless \ a \ \textless \ p[/tex]
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Gerren
Sin2a=2sinacosa
cosa=√1-0,8^2)=√0,36=0,6
sin2a=2*0,6*0,8=0,96
cos(a/2)=√((1+cosa)/2)=√((1+0,6)/2)=√1,6/2=√0,8
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Answers & Comments
cosa=√1-0,8^2)=√0,36=0,6
sin2a=2*0,6*0,8=0,96
cos(a/2)=√((1+cosa)/2)=√((1+0,6)/2)=√1,6/2=√0,8