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2015-08-30T12:02:26+05:30
Given that ⇒  Cos 11 +  \frac{sin 11}{cos 11} - sin 11 = tan 56

Solution - 

⇒Cos 11 +  \frac{sin 11}{cos 11} - sin 11

⇒ We have to divide the numerator and denominator by  cos 11 .

We get after dividing = 1 + tan  \frac{11}{1} - 1 tan11

Since tan 45 = 1 
By substituting the value of 1 in numrator we got ....

⇒ tan 45 + tan\frac{11}{1} - tan 45 tan 11
By using tan ( a + b ) 

We get,
⇒ tan ( 45 + 11 )
⇒ tan 56

Hence Prooved


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