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Y=-x, quadrant 2, what is the exact value of the trigonometric functions? The difference of two numbers is 12. if the smaller number is 25, what is the larger number? The company CREE claims their LEDs produce 303 lumens per watt. But can it really do that? An electron has a kinetic energy of 6.40 eV. Find its wavelength.? A parallel RC circuit has capacitive reactance of 962 ohms & resistance 1200 ohms. What is impedance of circuit?