A expressão (sen x + cos x)² é idêntica a:a) 1+ sen 2xb) 1+ cos 2xc) 1 + 2 sen x.... Pergunta de ideia deaninhakis

October 2020 1 64 Report

A expressão (sen x + cos x)² é idêntica a:
a) 1+ sen 2x
b) 1+ cos 2x
c) 1 + 2 sen x

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juhh159 Considerando que $(senx + cos x) ^{2}$ é um produto notavel:

$sen x ^{2} + 2* senx*cosx + cosx ^{2} =$

(lembrando que é uma identidade trigonometrica, $sen x^{2} + cos x^{2} = 1$ )

temos que é igual

1+ 2* senx*cosx

A resposta seria essa...porem não entendo pq nao esta entre as alternativas que vc colocou. Verifica se não copiou errado.

1 votes Thanks 5

aninhakis muito obrigada, na vdd eu não copiei errado. Mas deve ta certo pq na minha folha de exercícios tem alguns erros mesmo

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Lista de comentários

Completar: 1) July in Brazil is ............. than January. a)hoter b)more cold c)hotter d)colder e)as cold

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