Question

(√3) cosΘ -2sinΘcosΘ=0

answer: 0º, 45º, 135º, 180º
but i got 0º, 45º, 135º, 180º, 360º. Why 360º is rejected?

Answer 1

Did the problem specify a domain? Perhaps they only want answers in this interval:
\[0^{o}\le \theta <360^{o}\]

Answer 2

that was my thought too, but
i don't think 360 work

Answer 3

\(\cos(360)=\cos(0)=1\) and so \(\sqrt{3}\cos(360)=\sqrt{3}\)

Answer 4

But then 180 won't work for the same reason

Answer 5

true enough

Answer 6

\[\cos(x)\left(\sqrt{3}-2\sin(x)\right)=0\]
\[\cos(x)=0\] or \[\sin(x)=\frac{\sqrt{3}}{2}\]
now that i look, none of these are right

Answer 7

maybe theses are the answers to a different question