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If cos2x+2cosx=1 then sin^2x(2-cos^2x) i...

If `cos2x+2cosx=1` then `sin^2x(2-cos^2x)` is

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Knowledge Check

  • 2cos^(2)x+4cosx=3sin^(2)x if

    A
    `cos x=(-2+sqrt(14))/(5)`
    B
    `cosx=(-2+sqrt(19))/(5)`
    C
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    D
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