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posting for anyone else who comes across this thread: tan2x=5sin2x tan2x=5*tan2x*cos2x divide both sides by tan(2x) 1=5cos2x 0.2=cos2x cos^-1 both sides 78.46..=2x 39.2=x draw cos2x graph. as symmetrical next value = 180-39.2. and don't forget the values...