2006-12-08 01:53:53 · 4 answers · asked by MSI 1 in Science & Mathematics ➔ Mathematics
cos theta is -4/5
sintheta=3/5
tan theta=-3/4
tan 2 theta=2tantheta/1-tan^2theta
=2(-3/4)/(1-(9/16))
=(-3/2)(16/7)
=-24/7
hi maira your e-mail did not go through as it seems it has not been verified
not even now lol
2006-12-08 02:15:12 · answer #1 · answered by raj 7 · 0⤊ 0⤋
3/4/5 triangle, cos theta = -4/5 so sin theta = 3/5 (2nd quadrant).
Use the formula for tan (2 theta) and plug in the stuff above.
2006-12-08 02:08:46 · answer #2 · answered by Anonymous · 0⤊ 0⤋
sin theta will be 3/5 which u can easily observe from teh basic formula sin sqare theta + cos square theta=1.
now sin is +ive in 2nd quad
tan theta=-3/4
tan 2theta=2*tan theta/1-tan square theta
answer=3.42
2006-12-08 02:12:29 · answer #3 · answered by Franklin 3 · 0⤊ 0⤋
let theta be x
cosx= - 4/5
sinx=3/5
tanx= - 3/4
pi
tan2x=2tanx/(1-tanx*tanx)
=-3/4 / (1 - 9/16)
=-3/4 * 16/9= -4/3
So tan 2x= - 4/3
2006-12-08 02:30:37 · answer #4 · answered by iyiogrenci 6 · 0⤊ 0⤋