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यदि cotA=4, तो जाँच कीजिए कि (1-tan^(2)...

यदि `cotA=4,` तो जाँच कीजिए कि `(1-tan^(2)A)/(1+tan^(2)A)=cos^(2)A-sin^(2)A` है या नहीं।

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सिद्ध कीजिए कि 2tan^(-1)sqrt((b)/(a))=cos^(-1)((a-b)/(a+b))