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Solve 2 sin^2 x − sin x − 1 = 0 ?

1 Answer

Aug 10, 2018

#color(blue)(=> (2 sin x + 1) (sin x - 1)#

Explanation:

#2 sin^2 x - sin x - 1#

#=> 2 sin^2 x - 2 sin x + sin x - 1#

#=> 2 sin x(sin x - 1) + 1 (sin x - 1)#

#color(blue)(=> (2 sin x + 1) (sin x - 1)#

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