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If (sin^4x)/2+(cos^4x)/3=1/5 then (a) ...

If `(sin^4x)/2+(cos^4x)/3=1/5` then
(a) `tan^2x=2/3`
(b) `(sin^8x)/8+(cos^8x)/(27)=1/(125)`
(c) `tan^2x=1/3`
(d) `(sin^8x)/8+(cos^8x)/(27)=2/(125)`

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