lu0cselawnanna lu0cselawnanna
  • 21-11-2016
  • Mathematics
contestada

Solve sin2x + 2sinx = 0 for 0 ≤ x < 2π. ...?

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HomertheGenius
HomertheGenius HomertheGenius
  • 24-11-2016
sin 2 x + 2 sin x = 0
2 sin x cos x + 2 sin x = 0 / : 2
sin x cos x + sin x = 0
sin x ( cos x + 1 ) = 0
sin x = 0,  cos x + 1 = 0,  cos x = - 1;
Answer:
x = 0,  or x = π
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