the value for k for which sinx+cos(k+x)+cos(k-x)=2 has real solutions

Asked by Amit Adhikari | 17th Jul, 2011, 12:00: AM

Expert Answer:

We have
sinx+coskcosx-sinksinx+coskcosx+sinksinx=2
sinx +2coskcosx=2
sinx=2(1-coskcosx)
squaring both sides we get,

Answered by  | 17th Jul, 2011, 09:37: PM

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