Sinusoidal Steady-State Analysis

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A sinusoidal current is zero at t= 150μs and increasing at arate of 2x10^(4)π A/s. The maximum amplitude of the current is10 A.
(a) What is the frequency of i in radians persecond?
2000π rad/s
I don't understand how they got this.

(b) What is the expression for i?
How did they get -144?
I did

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