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(a^4-1)x^2-(a^2+1)(sin^(-1)sin^3 2)x+(co...

`(a^4-1)x^2-(a^2+1)(sin^(-1)sin^3 2)x+(cos^(-1)cos2)(a^2-1)=0` . Find the set of values of a so that above equation have roots of opposite in sign. `[-2,3]` b. `[-1,1]` c. `[-2,1]` d. `varphi`

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