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Stasya33
@Stasya33
July 2022
2
8
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упростите выражение sina-0.5sin2a*cosa/sin^2 и найдите его значение при a=-П/6
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Rimma200016
Если я правильно поняла условие, то так
1 votes
Thanks 2
Rimma200016
а, подставить забыла: 2 будет
valeol
=sina-0,5(2sina*cosa)*(cosa/1-cos^2a)- формула двойного угла=(sina-1sina*cosa*cosa)/1-cos^2a=(sina-sina*cos^2a)/1-cos^2a=(sina(1-cos^2a))/1-cos^2a=sina
3 votes
Thanks 2
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