[" (17) "arg theta=tan^(-1)(2tan^(2)theta)-(1)/(2)sin^(-1)((3sin2 theta)/(5+4cos2 theta))],[theta=pi cos4cos(pi)/(8 pi)sin theta=1]

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If 1/2 sin^(-1)((3sin2theta)/(5+4cos2theta))=(pi)/4 , then tan theta is equal to

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