本题目来源于试卷: IB MAI HL Geometry & Trigonometry Topic 3.4 Trigonometric Functions，类别为 IB数学
[问答题]
Two voltage sources r anc6( t4yy.vare connected to a circuit.errew r k 4vt:ha9axg *sq90:4 At time t milliseconds (ms), the4rxt q*ghavk4 rs9eewr9:: 0 a voltage from the first source is $V_1$(t)=12cos(20t) and the voltage from the second source is $V_2$(t)=18cos(20t+5), where both $V_1$(t) and $V_2$(t) are measured in volts.
1.Write, in the form V(t)=Acos(ωt+φ), an expression for the total voltage in the circuit at time t ms.
2.Hence write down the highest voltage in the circuit.
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