Question

tan 80°-tan 10/tan70=
​

Answer 1

Answer:

we know that ,

80 - 10 = 70

tan on both sides , we get ,

tan 80 - tan 10/1 + tan80*tan 10 = tan 70 ( tan ( A-B) = tan A - tanB /1 + tanA*tanB)

tan80 - tan 10 /tan 70 = 1+1 =2 ( since if A +B = 90 then tanA*tanB =1)

so the answer is 2.