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The values of k for which the equation sinx+cos (k+x)+cos (k-x)=2 has real solution.....
Dear Vishal sin x + 2 cos k * cos x = 2 Now multiply and divide it by sqrt(1 + 4 cos²k) And then make it a function of sin or cos. Then it will be very easy. If you even find it difficult, please feel free to ask.
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