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Find the General Solution of 2Sin²x + 3Cosx=0Class — 11Subject — MathematicsChapter — Trigonometric Functions

Answer»

2sin²x + 3cosx = 0

⇒ 2(1 - cos²x) + 3cosx = 0

⇒ 2 - 2cos²x + 3cosx = 0

⇒ 2cos²x - 3cosx - 2 = 0

⇒ 2cos²x - 4cosx + COSX - 2 = 0

2COSX(cosx - 2) + (cosx - 2) = 0

⇒ (2cosx + 1)(cosx - 2) = 0

HLO..

IPPEM KANARILELO..

⇒ cosx - 1/2, cosx = 2[Not POSSIBLE]

⇒ cosx = -1/2

⇒ x = 120°,240°

⇒ x = (2π/3) + 2πn, x = (4π/3) + 2πn



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