trigonometry basics solving quadratic equations

1.  Solve the equation in the interval [00,360]. Use an algebraic method
12 sin2α – 6 sin α = 4
Tan2 α + 7tanα + 9 = 0
4cos2 αsin α+2cos2 α=0
2sin α-1=csc α
2.  Solve the equation in the interval 0<= α<2Ï€
2sin2 α-sin α+11=0

 
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