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 62 Report

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

Lista de comentários

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.

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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