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सिद्ध कीजिए कि `tan""((1)/(2)cos^(-1)""(sqrt(5))/(3))=(3-sqrt(5))/(2)`

Answer» मान ` cos^(-1)""(sqrt(5))/(3)=theta implies cos theta =(sqrt(5))/(3)`
`implies tan""(1)/(2)(cos^(-1)""(sqrt(5))/(3))=tan""(theta)/(2)`
`=sqrt((1-cos theta )/(1+cos theta))=sqrt((1-sqrt(5)//3)/(1+sqrt(5)//3))=sqrt((3-sqrt(5))/(3+sqrt(5)))`
`implies tan""(1)/(2)(cos^(-1)""(sqrt(5))/(3))=(3-sqrt(5))/(2)`


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