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" 4."18.tan^(-1)sqrt((1+sin x)/(1-sin x)...

" 4."18.tan^(-1)sqrt((1+sin x)/(1-sin x))=(pi)/(4)+(x)/(2)

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sqrt((1+sin x)/(1-sin x))=tan((pi)/(4)+(x)/(2))

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If sqrt((1-sin x)/(1+sin x))=f((pi)/(4)-(x)/(2)) then f=

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