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]
In an unbalanced three-phay9kfq(,slo b ,se el)z69.5zn.egue sr.ve d eqes 2 ba8ht7ectrical circuit, the current at time t ms is giveg eevha9 zs.tq .n8db)6e rz.ee 2u57sn by
I(t)= 2sin(5t)+5sin(5t-$\frac{3π}{4})+10sin(5t-$\frac{5π}{4}$)
where I(t) is measured in milliamperes (mA).
1.Write I(t) in the form Acos(ωt+φ).
2.Hence find the highest current flowing through the circuit, and the time it first occurs.
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