Question

Medal: HELP?
xcosy = 539.6
xsiny = 439

xcosy + xsiny = 539.6 + 493
xcosy + xsiny = 1032.6
then?

Answer 1

Are you solving for \(x\)?

Answer 2

x and y

Answer 3

http://www.williamdoney.com/students/ENGG%20201/hwk%20solutions%20-%2012th%20edition/12e%20chap%2002.pdf#page=29

Answer 4

\[x\cos y+x\sin y=978.6~~\cancel{\large\implies}~~(x\cos y)^2+(x\sin y)^2=978.6^2\]
In general, \(a+b=c\) does not mean \(a^2+b^2=c^2\), but rather \((a+b)^2=c^2\).

Here's what I would suggest.
\[\frac{x\sin y}{x\cos y}=\tan y=\frac{439}{539.6}\]
Then you solve for \(y\), back-sub and solve for \(x\).

Answer 5

ohhh, that was exactly how the book does it with inverse tan; thanks!