


This Question is Closed

eroshea
Best Response
You've already chosen the best response.
0
\[if x+y=90, then \frac{ sinx tany }{ siny tanx } is equal \to?\]

hartnn
Best Response
You've already chosen the best response.
0
u want answer in terms of x or y ?

eroshea
Best Response
You've already chosen the best response.
0
the possible answers are
a. tanx b.1/tanx c.tanx d. 1/tanx

ash2326
Best Response
You've already chosen the best response.
2
given
\[x+y=90\]
\[\frac{\sin x \tan y}{\sin y \tan x}\ \ \ \ \ \ \ =\]
write all in terms of
y=90x
@eroshea
what's sin (90x)??

eroshea
Best Response
You've already chosen the best response.
0
cos x?

ash2326
Best Response
You've already chosen the best response.
2
good, so sin y=sin (90x)=cos x
similarly change tan y in terms of x

eroshea
Best Response
You've already chosen the best response.
0
i'm confused @.@

ash2326
Best Response
You've already chosen the best response.
2
tan y=tan (90x)=??

eroshea
Best Response
You've already chosen the best response.
0
that's cot y = (tan 90x)

ash2326
Best Response
You've already chosen the best response.
2
good so \[\frac{\sin x \tan y}{\sin y \tan x}\ \ \ \ \ \ \ =\frac{\sin x \cot x}{\cos x \tan x}\ \ \ \ \ \ \ = ?\]
Can you simplify this now?

eroshea
Best Response
You've already chosen the best response.
0
tanx?

eroshea
Best Response
You've already chosen the best response.
0
owh.. 1/tanx maybe?

ash2326
Best Response
You've already chosen the best response.
2
check again, are you sure?

eroshea
Best Response
You've already chosen the best response.
0
what i got was cosx/sinx =cotx or 1/tanx

ash2326
Best Response
You've already chosen the best response.
2
you're correct :)

eroshea
Best Response
You've already chosen the best response.
0
thanks! :))