How to solve this equation?

Hi everyone,

I want to solve this equation in Matlab. Until now I have the following code:

a=18
b=60
c=76.7
syms x
solx=solve('cos(x).*(a.*sin(x)+b)=c','x')

I get next error: Check for missing argument or incorrect argument data type in call to function 'solve'.

Error in Untitled (line 8)

solx=solve('cos(x).*(a.*sin(x)+b)=c','x')

I dont know what it is wrong, can anybody help me?

Any help is appriciated.

[Mario Malic]

Example from function solve in documentation.

syms a b c x
eqn = a*x^2 + b*x + c == 0 % equals to sign == 
eqn = cos(x).*(a.*sin(x) + b) == c;
solve(eqn, x)

[Sara Boznik]

Thank you so much, that works.

[Kitty Visser]

i have also this error

with this function

[V1,V2,V3]=solve('(V1-V2)/R1 = Is + 2*(V3-V2)/R3','(V2 - V1)/R1 + V2/R2 + (V2-V3)/R3 = 0','(V3-V2)/R3 + V3/R4 + 2*(V3-V2)/R3=0','V1','V2','V3')

[Mario Malic]

You're missing double equals sign in your equations.

Answer 1

[Ali Muhammad Hassaan]

a=18
b=60
c=76.7
syms x
eqn = cos(x).*(a.*sin(x)+b) == c
solx=solve(eqn)

[Sara Boznik]

Thank you!

[Vladimir Sovkov]

The sintax is correct here but it is of no help to find the solution, because there is no real-type one, and "solve" refuses working with the complex type. To find the solution you should reformulate the problem as a system of two real-type equations for the real and imaginary parts being two unknown variables.