y=2x^2cosx

Question

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Answer 1

y = (2x^2)cosx

solve by graphing

find x intercepts

x= 0, +/- pi/2, 3pi/2, 5pi/2, 7pi/2, ...

or set factors =0

x=arccos0 +pin/2 where n = any integer

and x=0

or y = 2x^(2cosx) then

x = 0, 9.4717, 15.731, etc radians