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Grade: 11 
        The values of k for which the equation sinx+cos (k+x)+cos (k-x)=2 has real solution.....
11 months ago

Answers : (1)

Arun
17615 Points 
							
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.
11 months ago
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