PDA

View Full Version : trigonometry problem


Anzas
Oct12-04, 01:09 PM
find the angle x
if its known that:
sin(x/2) = 1/2
tan(x)=sqrt(3)

0<=x<=360

Pyrrhus
Oct12-04, 01:24 PM
why don't you simply do arcsine and arctan?

Anzas
Oct12-04, 01:29 PM
because the whole point of the question is using trigonometric identities to solve it (believe me i would be happy to do the arctan and get it over with :smile: )

NateTG
Oct12-04, 01:37 PM
because the whole point of the question is using trigonometric identities to solve it (believe me i would be happy to do the arctan and get it over with :smile: )

You might discover something interesting about the problem though. (It's also worth noting that that there are special angles involved.)

Anzas
Oct12-04, 01:49 PM
i tried playing around with it

sin(x/2) = 1/2
tan(x)=sqrt(3)

i got

tan(x) = sin(x) / cos(x) = sqrt(3)

sin^2(x) / cos^2(x) = 3

but that didn't really lead me anywhere
i thought of ways to convert sin(x/2) to sin(x) with no luck

Tide
Oct12-04, 03:40 PM
find the angle x
if its known that:
sin(x/2) = 1/2
tan(x)=sqrt(3)

0<=x<=360

If you don't want to use the inverse trig functions directly then you may want to ponder the equilateral triangle!