"Compute |(2 + i)(cos(pi/6) - isin(pi/6))|"
With trying to answer this question, I first converted (2+i) to polar form (I got √3(cos(pi/3) - isin(pi/3) - I'm not sure if that's correct) so, I then had both in polar form. Afterwards, I multiplied the two and was left with an answer that did not match the correct answer (√5). My answer was still in polar form so, I'm unsure if that was an incorrect approach or just a mistake with my working out. Moreover, does having "|" outside the equation, change or mean anything to how you're supposed to solve it?