carlskat carlskat

23-01-2020
Mathematics

contestada

If cos2x-sinx=0 , then which of the following values could be sinx?

A) -1
B) -1/2
C) 0
D) 1

Respuesta :

23-01-2020

Answer:

C. 0

Step-by-step explanation:

hope it helped somehow

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kenlingdad kenlingdad

23-01-2020

Answer:

A) -1

Step-by-step explanation:

cos2x - sinx = 1 - 2 sin²x - sinx = 0

2 sin²x + sinx -1 = 0

(sinx + 1) (2sinx - 1) = 0

sinx = -1 or sinx = 1/2

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