# Trigonometry basics solving quadratic equations

**Question description**

1.
Solve the equation in the interval [0^{0},360].
Use an algebraic method

12 sin^{2}α – 6 sin α = 4

Tan^{2} α + 7tanα + 9 = 0

4cos^{2} αsin α+2cos^{2} α=0

2sin α-1=csc α

2. Solve the equation in the interval 0<= α<2π

2sin^{2} α-sin α+11=0

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