Question 733671
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1) Find all real numbers that satisfy the equation: cos x = square root 3 / 2.

2) Solve the equation: 6 cos(Alpha)+3=0 for 0 degree < alpha < 360 degree.

3) Find all real numbers in the interval[0,2pi) that satisfy the equation: cos^2x+2cosx+1=0.

4) Find all values of x in the interval [0degree,360 degree)that satisfy the equation. 
Round approximate answer to the nearest tenth of a degree: sin^2x+8sinx-4=0.

5) Find all angles in degrees that satisfy the equation: cos alpha=-0.609
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<H3>NEVER pack more than one problem per post.</H3>