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20b(4b3)3
Geometric proof of sin60∘sin40∘=4sin20∘sin80∘
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Replace the Cartesian equations with equivalent polar equations. x 2 + ( y − 2 ) 2 = 4
For each of the following differential equations, determine the general or particular solution: 2xy′+y=y2logx
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If an ideal cylindrical inductor/electromagnet is charged and then discharged, will the energy lost by charging the inductor/electromagnet be equal to the energy gained by discharging it or will some of it be lost to radiation? Based on what I know about magnetism, there should be no loss.
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Is it allowed to have the zeroth-component of a four-velocity be negative?This is referring to V 0 V^0 for a curved space metric with signature − + + + -+++ .
differential equations of second orderHow may I solve this differential equations: y ″ + 4 y = 12 x 2 − 16 x cos ( 2 x ) ?
Show that a → ⋅ b → = 1 4 | a → + b → | 2 − 1 4 | a → − b → | 2 I have tried: a → ⋅ b → = 1 4 | a → + b → | 2 − 1 4 | a → − b → | 2 a → ⋅ b → = 1 4 ( | a → | 2 + 2 | a → | | b → | + | b → | 2 ) − 1 4 ( | a → | 2 − 2 | a → | | b → | + | b → | 2 ) a → ⋅ b → = | a → | | b → | However it seems that the equation only holds true when a → and b → are collinear.Is that true?
What is the z-score of sample X, if n = 36 , μ = 13.7 , St.Dev = 21 , μ X = 9.9?
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