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xmax=Vo^2sin2x/g
hmax=1/2xmax
Vo^2sin^2x/2g=1/2Vo^2sin2x/g
sin^2x=sin2x
sin^2x=2 sinx cox
sinx=2cosx
tanx=2
x=63,38 derajat
catatan
x=alfa'
semoga membantu ^_^