4 cos2x 1 0 X 2 x 6 0 x 3 gt 2x 1 x 5 x 5 gt 0 10 1 x 10 4 sqrt 3 x 2 6 11x 6x 2 x 3 0 factor x 2 5x 6 simplify frac 2 3 frac 3 2 frac 1 4 x 2y 2x 5 x y 3 Show
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4 cos2x 1 0
4 cos2x 1 0
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Nilai Lim X 0 1 cos2x 1 cos 4x
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Solved Suppose That 2cos 2 x 4sin x cos x Asin2 x bcos2 x
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Explanation This is a cubic equation in cos x Sum of the coefficients is 0 So cos x 1 is a solution And so factorizing cosx 1 cos2 2cosx 1 0 Equation 8cos3x 1 3 3 3K views 3 years ago Trigonometric Equations Trigonometry Playlist sin 3pi 5 cos pi 15 cos 3pi 5 sin Trigonometric Identities Playlist tanx cotx
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Explanation Solve this quadratic equation for cos x by using the improved quadratic formula f x 4cos2x 4cosx 1 0 D d2 b2 4ac 16 16 32 d Take the inverse cosine of both sides of the equation to extract x x from inside the cosine x arccos 1 2 x arccos 1 2 Simplify the right side Tap for more steps x 3 x
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4 cos2x 1 0 - sin x sin frac x 2 0 0 le x le 2 pi cos x sin x 0 sin 4 theta frac sqrt 3 2 0 forall 0 le theta