- 1+cosx=2cos^2(x/2)?

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Find the grade(alfa) in which x^2 + y^2=8 finds y^2=2x
Can someone help me? Simplify the given expression. Write the answer with positive exponents.
Please Explain
(3^2/x^3)^-2 (x^4/4^2)^2? How many odd, seven digit numbers, greater
than 3 million, can be made from the digits
that follow: 1, 2, 3, 3, 4, 5, 5? What alcohol content does a liquid need to be flammable? Why are there three ics (two L2N3D and one 74hc595n) in DC motor driver? Kindly explain their proper functionality related to DC motors.?