- I need help with verifying this one: tan(2x)=(2sinxcos)/cos^2 x - sin^2 x?

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(2x^3)+(ax^2)+(bx)-(3) divided by (x-1) and (x-2) the remainders are 8 and 7. Find a and b.? A curve has a slope of 4x+2 at (x,y) at the point (1,3). What is its equation? Thanks in advance? A ionic bond forms between potassium and phosphorus:
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