Предмет: Алгебра, автор: liana5105

помогите с алгеброй!!!с полным решением!!!

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Ответы

Автор ответа: sedinalana

25
sin²a+cos²a=1
sin²80+cos²80=1
ответ D
26
tga*ctga=1
ctg40*tg140=ctg40*tg(180-40)=ctg40*(-tg40)=-1
ответ D
27
cosacosb+sinasinb=cos(a-b)
cos76cos34+sin79sin34=cos(79-34)=cos45=√2/2
ответ D
28
a=21,b=28
c=√a²+b²=√441+784=√1225=25
cosB=a/c=21/35=0,6
ответ E

liana5105: СПАСИБО ВАМ Огромнейшее!!!Вы самая самая♡

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