Question 1104365
<pre>
{{{4(cos("135°")^""+i*sin("135°")^"")*2(cos("45°")^""+i*sin("45°")^"")}}}

Multiply the coefficients (4)(2) = 8
Add the angles: 135° + 45° = 180°

{{{8(cos("180°")^""+i*sin("180°"))}}}

Evaluate the trig functions:

{{{8((-1)+i*(0)^"")}}}

{{{-8}}} <-- answer

Edwin</pre>