Find the square of 2a plus 3b
2 answers:
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now, notice, there are two valid angles for such a tangent, however, if we look at the complex pair, the "a" is negative and the "b" is positive, that means, "x" is negative and "y" is positive, and that only occurs in the 2nd quadrant, so the angle is in the second quadrant, not on the fourth quadrant.
thus
You can use this to help you. label the triangle like the picture and use the equations. I hope this helps.
