Q. Express z1=−14+14i in polar form.Express your answer in exact terms, using degrees, where your angle is between 0∘ and 360∘, inclusive.z1=
Calculate Magnitude: To express a complex number in polar form, we need to find its magnitude r and angle θ. The magnitude is found using the formula r=a2+b2, where a is the real part and b is the imaginary part of the complex number.For z1=−14+14i, we have a=−14 and b=14.Now we calculate the magnitude: r=(−14)2+(14)2=196+196=392=142.
Find Angle: Next, we need to find the angle θ. The angle is determined by the arctan function, θ=arctan(b/a). However, since the complex number is in the second quadrant (a is negative and b is positive), we need to add 180 degrees to the angle found by arctan(b/a) to get the correct angle in the range of 0 to 360 degrees.θ=arctan(14/−14)+180∘=arctan(−1)+180∘.We know that arctan(−1) corresponds to −45 degrees (or 315 degrees if we want a positive angle), so θ=arctan(b/a)0.
Write in Polar Form: Now we can write the complex number in polar form. The polar form is given by z=r(cos(θ)+isin(θ)), where r is the magnitude and θ is the angle.For z1, the polar form is z1=142(cos(135°)+isin(135°)).
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