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How to prove tan9-tan27-tan63+tan81=4 (All in degree)

How to prove
tan9-tan27-tan63+tan81=4
(All in degree)

Grade:12th Pass

1 Answers

vipul gupta
17 Points
8 years ago

tan 81=cot 9 tan 63=cot 27 Use tan A+cot A=2cosec 2A(easy proof) u wil gt ur exp in 18 and 54 degree..known angles... Put the values solve... If quess rite ans wud cm... Hope tht hlpd

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