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andrezito [222]
3 years ago
15

Which of the following is a solution to 2cos2x − cos x − 1 = 0?\

Mathematics
1 answer:
goblinko [34]3 years ago
5 0

Answer:

Option A is correct.

Solution for the given equation is,

Step-by-step explanation:

Given that : Let then our equation become; .....[1]

A quadratic equation is of the form:

.....[2] where a, b and c are coefficient and the solution is given by;

Comparing equation [1] and [2] we get;

a = 2 b = -1 and c =-1

then;Simplify:or and

Simplify:y = 1 and

Substitute y = cos x we have;⇒and⇒

The solution set:  

Therefore, the solution for the given equation   is, 0 degrees

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