1.

सिद्ध कीजिए कि `(cos 11^(@)+sin 11^(@))/(cos 11^(@)-sin 11^(@))=tan 56^(@)`

Answer» दायाँ पक्ष `=tan 56^(@)=tan(45^(@)+11^(@))`
`=(tan45^(@)+tan 11^(@))/(1-tan 45^(@) tan 11^(@))=(1+tan11^(@))/(1-tan 11^(@))`
`=(1+(sin 11^(@))/(cos11^(@)))/(1-(sin 11^(@))/(cos11^(@)))=(cos 11^(@)+sin 11^(@))/(cos 11^(@)-sin 11^(@))" "(because tan 45^(@)=1)`
= बायाँ पक्ष


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