Grade 12th PassTrigonometry
How to prove
tan9-tan27-tan63+tan81=4
(All in degree)
1 Answer
vipul gupta
Approved Tutor Answer14 Years agotan 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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