Find valueof tan 15 degree using tan (A-B)
=tanA-tan B/1+tanA tanB
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use tan (45 - 30)
tan 45 - tan 30 / 1 + tan 45. tan30
tan 45 = 1 and tan 30 = 1/ root 3
1 - 1/root 3 / 1 + tan 45 . tan 30
-0.855
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