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3senx - 2cos² = 0 recuerda cos²x = 1-sen²x
3senx - 2 (1-sen²x) = 0
3senx - 2 + 2sen²x = ordenando
2sen²x + 3senx -2 = 0 factorizando
2senx-------------- -1
senx -------------- +2
(2senx-1)(senx+2) = 0
2senx -1=0 senx = -2
senx = 1/2 senx = -2
arc sen(senx) = arc sen(1/2)
x = 30