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Asked by Raj

Given that tan25 degrees =a,express tan205 in terms of a.
5 years ago

Answers

Answered by Reiny
How do 25° and 205° relate?
Well, 205 - 180 = 25

and since 205° is in quadrant III, we know from the CAST rule
that the tangent in III is positive, therefore
tan 205°
= tan(205-180)°
= tan 25°
= a
5 years ago

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