Question

Express in surd form
a)tan (-15)
d)cot 75
@ganeshie8

Answer 1

hint : -15 = 30-45

Answer 2

familiar with angle sum/difference formulas ?

Answer 3

Not familiar..
But I need to learn these formulas..

Answer 4

http://oakroadsystems.com/twt/sumdiff.htm#TanSum

Answer 5

\[\large \tan (A - B) = \dfrac{\tan A - \tan B}{1 + \tan A \tan B}\]

Answer 6

\[\large \tan (-15) = \tan (30 - 45) = ?\]

Answer 7

like this