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2cos(X) - 3tan(X) = 0
2cos(X) - 3[sen(X)/cos(X)] = 0
Paso el coseno que divide a multiplicar a 0; se anula.
2cos²(X) - 3sen(X) = 0
cos²(X) = 1 - sen²(X)
2(1 - sen²(X)) - 3sen(X) = 0
-2sen²(X) - 3sen(X) + 2 = 0
U = sen(X)
-2U² - 3U + 2 = 0; a = -2, b = -3, c = 2
U = [3 +/- 5]/(-4)
U1 = [3 + 5]/-4 = -2
U2 = [3 - 5]/-4 = 0.5
Como U = sen(X)
X = 30°
Rta: X = 30°
2cosx=3
2cosx²=3senx
Luego cosx²+senx²=1
reemplazando:
2(1-senx²)=3(senx)
2senx²+3senx-2=0
factorizando por aspa simple:
(senx+2)(2senx-1)=0
∴senx=-2 ∨ senx=
bueno no tenemos a q cuadrante pertenece
sen30° =1/2
x=30°