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Solve for x,in the equation cos3x+cosx=2cosx,where0 |
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Answer» Answer: Explanation: [cos 3x + cos x ] - cos 2x = 0 2 cos [(3x + x)/2] .cos [(3x-x)/2] - cos 2x = 0 2 cos 2x . cos x - cos 2x = 0 cos 2x [ 2 cos x - 1 ] = 0 cos 2x = 0 or cos x = 1/2 = cos π/3 2x = (2n +1 )π/2 or x = 2mπ +- π/3 x = (2n + 1 ) π/4 or x = 2mπ +- π/3 ; where n , m ∈ I Read more on Brainly.in - brainly.in/question/1357256#readmore |
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