Предмет: Алгебра, автор: Алиш1401

Помогите с алгеброй прошууОочень надо

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Автор ответа: sedinalana

1

1
cosa+cosa-tga+tga=2cosa
2
1)a/√b(√a+√b)-√b/(√a+√b)=(a-b)/√b(√a+√b)=(√a+√b)(√a-√b)/√b(√a+√b)=
=(√a-√b)/√b
2)(√a-√b)/√b*3b√b/(√a-√b)=3b

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