sequenceA [(+3), (*4)]を計算してみようと思います。 sequenceA [(+3), (*4)] = (:) <$> (+3) <*> sequenceA [(*4)] = (:) <$> (+3) <*> ((:) <$> (*4) <*> pure []) = (:) <$> (+3) <*> ((:) <$> (*4) <*> (\_ -> [])) = (:) <$> (+3) <*> ((\_ -> (:)) <*…