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# Solving Cos trigonometric equation

Posted 11 years ago
 Could you solve this equation please?5*Cos[µ]=-1.7677669529663687and 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
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Posted 11 years ago
 Put this into Wolfram|Alpha ( LINK ):Solve 5*Cos[x] == -1.7677669529663687
Posted 11 years ago
 My dear friends Nasser and Peter,I do feel grateful to have thise answersThank you very much indeed
Posted 11 years ago
 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}Peter
Posted 11 years ago
 eq = 5*Cos[x] == -1.7677669529663687;sol = FindRoot[eq, {x, 0.1}];5*Cos[x /. sol]gives-1.76776695296637In[18]:= solOut[18]= {x -> 10.6342071636576}