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Multiple choice

If $\sin { \alpha } $ and $\cos { \alpha } $ are the roots of the equation $l{ x }^{ 2 }+mx+2ln=0$, then

  1. $ { l }^{ 2 }-{ m }^{ 2 }+2ln=0$
  2. $ { l }^{ 2 }+{ m }^{ 2 }+2ln=0$
  3. $ { l }^{ 2 }+{ m }^{ 2 }-2ln=0$
  4. $ { l }^{ 2 }+{ m }^{ 2 }+ln=0$
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  • Algebra (3715 questions)
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