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सिद्ध कीजिए कि ` cos^(-1)x+cos^(-1)""((x)/(2)+(1)/(2)sqrt(3-3x^(2)))=(pi)/(3)` |
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Answer» माना `cos^(-1)x=thetaimplies x=cos theta ` तथा ` sqrt(1-x^(2))=sqrt(1-cos^(2)theta)=sin theta ` अब , माना बायाँ पक्ष `= cos^(-1)x+cos^(-1)((x)/(2)+(sqrt(3))/(2)sqrt(1-x^(2)))` `=theta+cos^(-1)(cos""(pi)/(3)*cos theta+sin""(pi)/(3)*sin theta)` `= theta + cos^(-1)[cos""((pi)/(3)-theta)]=theta+((pi)/(3)-theta)` `= (pi)/(3)=` दायाँ पक्ष |
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