# HP Forums

Full Version: Solve() command with trigonometric equations
You're currently viewing a stripped down version of our content. View the full version with proper formatting.
I tried solve command to solve the following system of equation:

3*sin(x) + 4*cos(y) = 6
4*sin(y) + 3*cos(x) = 1

Code:
`solve({3*sin(x)+4*cos(y)=6, 4*sin(y)+3*cos(x)=1},{x,y})`

Calculation is in radian, and found no solution. When using TI Nspire Cas, I have got answer with the warning "More solutions may exist. Try specifying appropriate lower and upper bounds and/or a guess. " Any setting required to let calculator to get the right solution?
fsolve for numerical approximate solutions, solve is for exact symbolic.

Also, it is much easier to put your equation in the command line, and then do COPY on your keyboard to get the text. Then you can just paste it in and anyone can paste into their system to test. Otherwise people have to type manually everything out.
In CAS:

fsolve([(3*sin(x)+4*cos(y)) = 6,(4*sin(y)+3*cos(x)) = 1],[x,y],[0,0])

Result:

[0.799756530541,−0.276157754943]

Please resize your images before posting them. It would really be appreciated.