Предмет: Алгебра, автор: хХкатюшкаХх

помогите вычислить sin2a ,если cosa=3/5 и п/2,

Ответы

Автор ответа: Lesben

Počemy ešče k zadaniju napisano pí/2?
coskv a =1 - sinkv a, 9/25 = 1 - sinkv a,
sinkv a = 1-9/25 = 16/25
sin a = 4/5
sin2a = 2.sina.cosa
sin2a = 2.4/5.3/5 = (2.12)/25 = 24/25

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