Modulus and argument of complex number

Modulus and argument of complex number (Question)

1. Determine the modulus and argument of 10 + 5i.
2. Express 10 + 5i in the form of r(cos a + sin a*i)

Guide:

|a + bi| = r = √(a² + b²)
Argument of the complex number = tan^-1(b/a)

Argument form of a complex number
x + yi = r(cos a + sin a*i)

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