If 7cos^(2)x+sinx cos x-3=0 then x=...

If `7cos^(2)x+sinx cos x-3=0` then x=

`x=n pi+(pi)/4, n inZ`

`x=kpi+tan^(-1)(4/3), k in Z`

`x=kpi+tan^(-1)(3/4), k in Z`

`x=npi+(pi)/3, n in Z`

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The correct Answer is:

B, C

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If 7 cos ^(2) x + sin x cos x - 3 then x =

`x = n pi + (3 pi)/(4), n in Z`

`x = k pi + tan^(-1) ((4)/(3)), k in Z`

`x = k + tan^(-1) ((4)/(3)) , k in Z`

`x = n pi + (pi)/(3), n in Z`

`n pi +(-1)^(n)pi//10`

`n pi -(-1)^(n)pi//10`

`2n pi pm pi//10`

`n pi + pi//10`

`n pi + pi//8`

`n pi//2 + pi//8`

`(-1)^(2)n pi//2 + pi//8`

`2n pi + Cos^(-1)3//2`