Question

tan^-1 7/9 + tan^-1 1/8 is equal to
a) tan^-1(65/72)
b) tan^-1(63/65)
c) Π/4
d)Π/2​

Answer 1

Step-by-step explanation:

tan^-1{ 7/9 + 1/8 / 1 - 7/9 * 1/8}

tan^-1 { 56+9/72-7 }

tan^-1 { 65/65}

tan^-1 (1)

= π/4