Question

prove that

(cos11+sin11)÷(cos11-sin11)=tan56


*refer to attached image
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Answer 1

Given that ⇒  Cos 11 +  = tan 56

Solution - 

⇒Cos 11 + 

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

We get after dividing = 1 + tan 

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

⇒ tan 45 + tan - tan 45 tan 11
By using tan ( a + b ) 

We get,
⇒ tan ( 45 + 11 )
⇒ tan 56

Hence Prooved

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