The Student Room Group

Trig help please

nevermind lol
(edited 4 years ago)
Original post by arcticmonkeys456
I expanded the cos addition formula and did rearranging and it gave me -2 + root3 = tan x again but i don’t know how to get the answer of 11pi/12

Well by the periodicity of the tan function (repeats every pi), tan 11pi/12 = tan -pi/12 ... does that help?
Original post by Justvisited
Well by the periodicity of the tan function (repeats every pi), tan 11pi/12 = tan -pi/12 ... does that help?

yep thank you i realised my silly mistake just as i posted it 😂 thank you!

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