The is measure of a country's total economic output. A. gross domestic product
B. national debt
C. federal budget
D. budget deficit

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Ineed to know the answer to this algebra question.

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota

Square a has a side length of (2x-7) and square b has a side length of (-4x+18). how much bigger is the perimeter of square b than square a?and show all work! you so