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Utilizas el teorema del coseno
Y reemplazas a lo que necesites
p² = q² + r² - 2qr cos[P]
q² = r² + p² - 2pr cos[Q]
r² = p² + q² - 2pq cos[R]
Despejas la incógnita que requieras
CosQ = [ (p² - q² + r²) / (-2pr) ]
CosQ = [ ((3)² - (6)² + (4²) / (-2)(3)(4)) ]
CosQ = [ (9 - 36 +16) / (-24) ]
CosQ = [ (-11) / (-24) ]
CosQ = [0,458333...]
Shift + Cos * 0,45833...
Q = 117.27°