How to solve this equation?

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Sara Boznik on 29 Aug 2020
Edited: Mario Malic on 4 Sep 2020
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.
Kitty Visser on 4 Sep 2020
Edited: Kitty Visser on 4 Sep 2020
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 on 4 Sep 2020
Edited: Mario Malic on 4 Sep 2020

Ali Muhammad Hassaan on 29 Aug 2020
a=18
b=60
c=76.7
syms x
eqn = cos(x).*(a.*sin(x)+b) == c
solx=solve(eqn)
Sara Boznik on 29 Aug 2020
Thank you!
Vladimir Sovkov on 29 Aug 2020
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.