The values of k for which the equation sinx+cos (k+x)+cos (k-x)=2 has real solution.....
vishal mishra , 7 Years ago
Grade 11
Trigonometry> The values of k for which the equation si...
1 Answers
Arun
Last Activity: 7 Years ago
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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