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Solving Cos trigonometric equation

Posted 10 years ago
Could you solve this equation please?
and please I need to find the solution in radian measuement and i also don't know what is the procedure that solve it. I am looking forward to receive the answere.
many thanks
POSTED BY: Ahmed Al-Ali
4 Replies
Posted 10 years ago
Put this into Wolfram|Alpha ( LINK ):
Solve 5*Cos[x] == -1.7677669529663687
POSTED BY: Bill Simpson
Posted 10 years ago
My dear friends Nasser and Peter,
I do feel grateful to have thise answers
Thank you very much indeed 
POSTED BY: Ahmed Al-Ali
Hi, my dear friend! Do you search the following solutions?
In[13]:= x = ArcCos[-1.7677669529663687/5];
K = x - Pi/2;
Table[(2 i - 1)/2*Pi + (-1)^(i - 1) K, {i, 5}]

Out[15]= {1.93216, 4.35102, 8.21535, 10.6342, 14.4985}
POSTED BY: Peter Bischet
eq = 5*Cos[x] == -1.7677669529663687;
sol = FindRoot[eq, {x, 0.1}];
5*Cos[x /. sol]
In[18]:= sol
Out[18]= {x -> 10.6342071636576}
POSTED BY: Nasser M. Abbasi
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