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सिद्ध कीजिए - `tan 225^(@)cot 405^(@)+tan 765^(@)cot 675^(@)=0`

Answer» हम जानते हैं,
`tan 225^(@)=tan(180^(@)+45^(@))=tan45^(@)=1" "[because tan(180^(@)+theta)=tan theta]`
`cot 405^(@)=cot(360^(@)+45^(@))=cot 45^(@)=1" "[because cot (360^(@)+theta)=cot theta]`
`tan 765^(@)=tan(2xx360^(@)-45^(@))=-cot 45^(@)=-1" "[because tan(2xx360^(@)+theta)=tan theta]`
तथा`" "cot(675^(@))=cot(2xx360^(@)-45^(@))=-cot 45^(@)=-1`
बायाँ पक्ष `" "=tan 225^(@) cot 405^(@)+tan 765^(@)cot 675^(@)`
`=1xx1+1xx(-1)" "`(उपरोक्त मान रखने पर)
= 0 = दायाँ पक्ष


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