Question 614602
Which of the following is not a solution to the equation 4sin^2 X = 1 
(a) 30
(b) 210
(c) 150
(d) 120
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4sin^2x = 1
sin^x=1/4
sinx=1/2
x=30º and 150º in quadrants I  and II where sin>0
(b) and (d) are not the solutions