Tan (a+20°) = 1,find A. – InterviewSolution

1.

Tan (a+20°) = 1,find A.

Answer»

$tan(a+20^{0} )=1$ ⇒

$tan(a)+tan20^{0} =1$ ⇒

$tan(a)=1-tan20^{0}$ ⇒

$a=tan^{-1} (1-20^{0} )$ ⇒

$a=tan^{-1} (1)-tan^{-1} (20^{0} )$ ⇒

$a=45-87.12=-42.12$

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