How to prove
tan9-tan27-tan63+tan81=4
(All in degree)
Saurabh Guha , 14 Years ago
Grade 12th Pass
Trigonometry> compound angles...
1 Answers
vipul gupta
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
Approved Last Activity: 14 Years ago
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