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