Question

tan (a+20°) = 1,find A.

Answer 1

Answer:

$tan(a+20^{0} )=1$ ⇒

$tan(a)+tan20^{0} =1$ ⇒

$tan(a)=1-tan20^{0}$⇒

$a=tan^{-1} (1-20^{0} )$⇒

$a=tan^{-1} (1)-tan^{-1} (20^{0} )$ ⇒

$a=45-87.12=-42.12$

Step-by-step explanation: