Question

find all the angles between 0 and 360 degrees for
tan2x = cot40.

So we have the obvious method, with turning cot40 into a number, but is there any other method?? IB maths HL talking here :P

Answer 1

yup, tan a = cot (90-a)
so tan 2x = ?

Answer 2

so 90 - 2x = 40 ??

Answer 3

yup, x= ?

Answer 4

x = 25.

AHHH. MINDBLOWN :P

Answer 5

one more solution is there

Answer 6

tan(x+180) = tan x
put x= 25 here

Answer 7

of course, 205.

Answer 8

hahahahahahah, thank youuu :) you have just saved me from the wrath of my math teacher :P

Answer 9

welcome ^_^