1.

The equation `5^(1+log_(5)cosx)=5/2`hasA. no solutionB. one solutionC. two solutionsD. more than two solutions

Answer» Correct Answer - D
We have,
`5^(1+log_(5)cosx)=(5)/(2)`
` implies1+log_(5)5+log_(5) coss=log_(5)5-log_(5)2`
`implies log_(5)cos x=-log_(5)2`
`implies log_(5) cos x=log_(5)2^(-1)`
`implies cosx=2^(-1) implies cos x=(1)/(2) impliesx=2n pi+-(pi)/(3),n in Z`


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