1.

Number of roots of the equation `(3+cos"x")^2=4-2sin^8x ,x in [0,5pi]a r e`_________

Answer» Correct Answer - 3
`4 le L.H.S. le 16`
`2 le R.H.S. le 4`
Hence, equality can occur only when both sides are 4, which is possible if `x=pi, 3pi, 5 pi`.
That is, there are three solutions.


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