Question

tan-1 1/4 +2tan-1 1/5 = tan-1 32/43​

Answer 1

Step-by-step explanation:

let tan-1 be x then

x/4 + 2x/5 = 32x/43

x(1/4 + 2/5) = x(32/43)

1/4 + 2/5 = 32/43

1 × 5 + 2 × 4/ 20 = 32/43

5 + 8/ 20 = 32/43

13/20 = 32/43

SINCE, 13/20 is not equal to 32/43 the question is wrong....

HENCE PROVED