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\frac { \operatorname { cos } 11 ^ { \circ } + \operatorname { sin } 11 ^ { \circ } } { \operatorname { cos } 11 ^ { \circ } - \operatorname { sin } 11 ^ { \circ } } = \operatorname { cot } 34 ^ { \circ } |
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Answer» divide both numerator and denominator by cos11= 1+tan11/1- 1tan11since tan 45=1 now we wil subtitute this value of 1 here in numerator=tan45+tan11/1-tan45tan11 (since it is the formula for tan (a+b)so)=tan(45+11)=tan56= tan( 90 - 34)= cot 34 |
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